Re: Beginners question with Sling.
Thank you all for you help and advice I have to say that I am struggling with Apache Sling. I am an experienced developer, and have put the time in: I think I am on day 5 now, and while I am running launchpad, I am getting nowhere flat with using it from the Java Code. To be honest am getting quite demoralized over it. I missed the email about the developer version of CRX, so I will get that and play with it. I am quite keen to stay in the open source world, although I take your point that its a very good way to learn about the language. So I have a specific pain at the moment. The code sample I gave in the first post is still not working, although the HTML post is (thank you: that gave me a feel good factor that this project actually works). The advise to use Firebug was very good and caused me to add a couple of headers. DefaultHttpClient client = new DefaultHttpClient(); client.getCredentialsProvider().setCredentials(new AuthScope(localhost, 8080), new UsernamePasswordCredentials(admin, admin)); String nodeName = newNodeb8; ListNameValuePair formParams = Arrays.NameValuePair asList(new BasicNameValuePair(param1, value1), new BasicNameValuePair(param2, value2)); UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, UTF-8); HttpPost action = new HttpPost(http://localhost:8080/; + nodeName); action.addHeader(Content-Type, application/x-www-form-urlencoded); action.addHeader(enctype, multipart/form-data); action.setEntity(entity); HttpResponse response = client.execute(action); System.out.println(Status: + response.getStatusLine().getStatusCode()); System.out.println(Reason: + response.getStatusLine().getReasonPhrase()); System.out.println(Reason: + response.getStatusLine()); HttpEntity responseEntity = response.getEntity(); String page = responseEntity == null ? Empty Response : EntityUtils.toString(responseEntity); System.out.println(Response); System.out.println(page); The result is: Status: 500 Reason: Internal Server Error Reason: HTTP/1.1 500 Internal Server Error Response html head titleError while processing /newNodeb8/title /head body h1Error while processing /newNodeb8/h1 table tbody tr tdStatus/td tddiv id=Status500/div/td /tr tr tdMessage/td tddiv id=Messagejavax.jcr.AccessDeniedException: /newNodeb8/param2: not allowed to add or modify item/div/td /tr tr tdLocation/td tda href=/newNodeb8 id=Location/newNodeb8/a/td /tr tr tdParent Location/td tda href=/ id=ParentLocation//a/td /tr tr tdPath/td tddiv id=Path/newNodeb8/div/td /tr tr tdReferer/td tda href= id=Referer/a/td /tr tr tdChangeLog/td tddiv id=ChangeLogprecreated(/newNodeb8);br/modified(/newNodeb8/param1);br/modified(/newNodeb8/param2);br//pre/div/td /tr /tbody /table pa href=Go Back/a/p pa href=/newNodeb8Modified Resource/a/p pa href=/Parent of Modified Resource/a/p /body /html The response I get indicates that I have a security problem. I suspect that there is an error in the credentials. Of course as luck would have it the apache http client API has just had a radical rewrite and all the tutorials and advise are for the old interface... Do any of you have a code snippet like this that actually works? When I get this working, I'll write it up as a tutorial about using it from Java! On Thu, Jul 7, 2011 at 2:32 PM, Mark Herman mher...@nbme.org wrote: You could probably use their tools to create bundles then just deploy the bundles to your sling instance. Just need to say that using their tools in this manor may violate the developer edition's license agreement, I don't know. I'd still suggest looking into the product to help learn the language, but make sure you carefully read the license agreement before actually deploying bundles to sling. -Original Message- From: Mark Herman Sent: Thursday, July 07, 2011 9:04 AM To: users@sling.apache.org Subject: RE: Beginners question with Sling. In reference to ESP vs JSP: You may be able to use Day CRX (now Adobe) documentation as a resource. They have a series of blogs called CRX Gems. Some are product specific but most are really just taking advantage of sling. http://dev.day.com/content/ddc/blog.html?_charset_=ISO-8859-1query=crx+gems; main_entries_start=15blog=searchy=0x=0 Page back into newer topics as well. Here are some links that I have stashed away that may be of interest to you: http://dev.day.com/content/ddc/blog/2010/07/learning_about_espv.html https://cwiki.apache.org/SLING/scripting-variables.html http://www.lucamasini.net/Home/sling-and-cq5/accessing-relational-data-as-sli ng
Re: Beginners question with Sling.
On 08.07.11 10:39, Phil Rice phil.rice.erud...@googlemail.com wrote: DefaultHttpClient client = new DefaultHttpClient(); client.getCredentialsProvider().setCredentials(new AuthScope(localhost, 8080), new UsernamePasswordCredentials(admin, admin)); I guess you need to use preemptive auth: client.getParams().setAuthenticationPreemptive(true); http://hc.apache.org/httpclient-3.x/authentication.html Regards, Alex -- Alexander Klimetschek Developer // Adobe (Day) // Berlin - Basel
Re: Beginners question with Sling.
Hi Phil Check out the integration tests, as Bertrand suggested. In the class AbstractAuthenticatedTest[0] there is pretty much the same code you're trying to write. I think that should get you going. Regards Julian [0] http://svn.apache.org/repos/asf/sling/trunk/launchpad/integration-tests/src/main/java/org/apache/sling/launchpad/webapp/integrationtest/AbstractAuthenticatedTest.java On Fri, Jul 8, 2011 at 11:19 AM, Alexander Klimetschek aklim...@adobe.com wrote: On 08.07.11 10:39, Phil Rice phil.rice.erud...@googlemail.com wrote: DefaultHttpClient client = new DefaultHttpClient(); client.getCredentialsProvider().setCredentials(new AuthScope(localhost, 8080), new UsernamePasswordCredentials(admin, admin)); I guess you need to use preemptive auth: client.getParams().setAuthenticationPreemptive(true); http://hc.apache.org/httpclient-3.x/authentication.html Regards, Alex -- Alexander Klimetschek Developer // Adobe (Day) // Berlin - Basel
Re: Beginners question with Sling.
Thanks for the help Alex. Unfortunately that is one of the things that has changed in the new API. Its no longer a method available from the parameters. However the advice to follow the test framework was very good and the following now works. I can rip this apart and reduce to to the minimum working, which I will post for the benefit of anyone else trying to do this. DefaultHttpClient httpClient = new DefaultHttpClient(); RequestExecutor executor = new RequestExecutor(httpClient); String nodeName = slingNode1; ListNameValuePair formParams = Arrays.NameValuePair asList(new BasicNameValuePair(param1, value1), new BasicNameValuePair(param2, value2)); UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, UTF-8); System.out.println(executor.execute(requestBuilder.buildPostRequest(nodeName).withEntity(entity).withCredentials(admin, admin)).getContent()); System.out.println(executor.execute(requestBuilder.buildGetRequest(nodeName + .json)).getContent()); Once again thanks for all the help, and I look forward to seeing some of you in September at Berlin. Phil On Fri, Jul 8, 2011 at 10:19 AM, Alexander Klimetschek aklim...@adobe.comwrote: On 08.07.11 10:39, Phil Rice phil.rice.erud...@googlemail.com wrote: DefaultHttpClient client = new DefaultHttpClient(); client.getCredentialsProvider().setCredentials(new AuthScope(localhost, 8080), new UsernamePasswordCredentials(admin, admin)); I guess you need to use preemptive auth: client.getParams().setAuthenticationPreemptive(true); http://hc.apache.org/httpclient-3.x/authentication.html Regards, Alex -- Alexander Klimetschek Developer // Adobe (Day) // Berlin - Basel
Re: Beginners question with Sling.
Also thanks Julain/Bertand. I now have about the simplest hello world
program working. I suspect as I get further into the project, I will need to
look at the authentication system a lot more thoroughly, but for now I am
happy with just being able to POST and GET data!
public class PopulateRepository {
public static void main(String[] args) throws Exception {
String nodeName = newNodea;
String userName = admin;
String password = admin;
DefaultHttpClient client = new DefaultHttpClient();
client.addRequestInterceptor(new PreemptiveAuthInterceptor(), 0);
client.getCredentialsProvider().setCredentials(new AuthScope(localhost,
8080), new UsernamePasswordCredentials(userName, password));
UrlEncodedFormEntity entity = new
UrlEncodedFormEntity(Arrays.NameValuePair asList(new
BasicNameValuePair(param1, value11), new BasicNameValuePair(param2,
valueq)), UTF-8);
HttpPost action = new HttpPost(http://localhost:8080/; + nodeName);
action.setEntity(entity);
HttpResponse response = client.execute(action);
System.out.println(Status: + response.getStatusLine().getStatusCode());
}
private static class PreemptiveAuthInterceptor implements
HttpRequestInterceptor {
@Override
public void process(HttpRequest request, HttpContext context) throws
HttpException, IOException {
AuthState authState = (AuthState)
context.getAttribute(ClientContext.TARGET_AUTH_STATE);
CredentialsProvider credsProvider = (CredentialsProvider)
context.getAttribute(ClientContext.CREDS_PROVIDER);
HttpHost targetHost = (HttpHost)
context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
// If not auth scheme has been initialized yet
if (authState.getAuthScheme() == null) {
AuthScope authScope = new AuthScope(targetHost.getHostName(),
targetHost.getPort());
// Obtain credentials matching the target host
Credentials creds = credsProvider.getCredentials(authScope);
// If found, generate BasicScheme preemptively
if (creds != null) {
authState.setAuthScheme(new BasicScheme());
authState.setCredentials(creds);
}
}
}
}
}
On Fri, Jul 8, 2011 at 11:43 AM, Phil Rice phil.rice.erud...@googlemail.com
wrote:
Thanks for the help Alex. Unfortunately that is one of the things that has
changed in the new API. Its no longer a method available from the
parameters. However the advice to follow the test framework was very good
and the following now works. I can rip this apart and reduce to to the
minimum working, which I will post for the benefit of anyone else trying to
do this.
DefaultHttpClient httpClient = new DefaultHttpClient();
RequestExecutor executor = new RequestExecutor(httpClient);
String nodeName = slingNode1;
ListNameValuePair formParams = Arrays.NameValuePair asList(new
BasicNameValuePair(param1, value1), new BasicNameValuePair(param2,
value2));
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams,
UTF-8);
System.out.println(executor.execute(requestBuilder.buildPostRequest(nodeName).withEntity(entity).withCredentials(admin,
admin)).getContent());
System.out.println(executor.execute(requestBuilder.buildGetRequest(nodeName
+ .json)).getContent());
Once again thanks for all the help, and I look forward to seeing some of
you in September at Berlin.
Phil
On Fri, Jul 8, 2011 at 10:19 AM, Alexander Klimetschek aklim...@adobe.com
wrote:
On 08.07.11 10:39, Phil Rice phil.rice.erud...@googlemail.com wrote:
DefaultHttpClient client = new DefaultHttpClient();
client.getCredentialsProvider().setCredentials(new AuthScope(localhost,
8080), new UsernamePasswordCredentials(admin, admin));
I guess you need to use preemptive auth:
client.getParams().setAuthenticationPreemptive(true);
http://hc.apache.org/httpclient-3.x/authentication.html
Regards,
Alex
--
Alexander Klimetschek
Developer // Adobe (Day) // Berlin - Basel
Re: Beginners question with Sling.
Out of curiosity, why are you using Java and access Sling through HTTP? If you really like Java, you can create an OSGi bundle and deploy the bundle to Sling (felix, /system/console). You can put Servlets and other useful utilities in the bundle. And, you can access the repository directly without going through HTTP, but through JCR or Sling API. On Fri, Jul 8, 2011 at 6:43 AM, Phil Rice phil.rice.erud...@googlemail.comwrote: Thanks for the help Alex. Unfortunately that is one of the things that has changed in the new API. Its no longer a method available from the parameters. However the advice to follow the test framework was very good and the following now works. I can rip this apart and reduce to to the minimum working, which I will post for the benefit of anyone else trying to do this. DefaultHttpClient httpClient = new DefaultHttpClient(); RequestExecutor executor = new RequestExecutor(httpClient); String nodeName = slingNode1; ListNameValuePair formParams = Arrays.NameValuePair asList(new BasicNameValuePair(param1, value1), new BasicNameValuePair(param2, value2)); UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, UTF-8); System.out.println(executor.execute(requestBuilder.buildPostRequest(nodeName).withEntity(entity).withCredentials(admin, admin)).getContent()); System.out.println(executor.execute(requestBuilder.buildGetRequest(nodeName + .json)).getContent()); Once again thanks for all the help, and I look forward to seeing some of you in September at Berlin. Phil On Fri, Jul 8, 2011 at 10:19 AM, Alexander Klimetschek aklim...@adobe.comwrote: On 08.07.11 10:39, Phil Rice phil.rice.erud...@googlemail.com wrote: DefaultHttpClient client = new DefaultHttpClient(); client.getCredentialsProvider().setCredentials(new AuthScope(localhost, 8080), new UsernamePasswordCredentials(admin, admin)); I guess you need to use preemptive auth: client.getParams().setAuthenticationPreemptive(true); http://hc.apache.org/httpclient-3.x/authentication.html Regards, Alex -- Alexander Klimetschek Developer // Adobe (Day) // Berlin - Basel
Re: Beginners question with Sling.
On Fri, Jul 8, 2011 at 1:31 PM, Julian Sedding jsedd...@gmail.com wrote: ...Typically when working with Sling you don't access it via HTTP a lot. Rather you work within Sling. I.e. you write scripts that run within an authenticated request (which typically originates from a browser). I believe that getting inside Sling can be a little tricky at the beginning and that's where CRX with its tooling can certainly help Though our samples, like the Slingbucks one, [1] will show you how to combine java and scripting code to create applications with Sling. -Bertrand [1] http://svn.apache.org/repos/asf/sling/trunk/samples/slingbucks
Re: Beginners question with Sling.
Why don't you use Jackrabbit via DavEx or RMI? http://wiki.apache.org/jackrabbit/RemoteAccess I don't think Sling is a remote repository. I'm not sure what you meant by a mixture of structured and unstructured data. Have you looked at other databases such as CouchDB or MongoDB? On Fri, Jul 8, 2011 at 8:05 AM, Phil Rice phil.rice.erud...@googlemail.comwrote: @Sam Lee Why do you want to access through Java My client is going to be an Eclipse Plugin. In practice I will probably use Scala or Clojure, but I didn't want to pollute my pitiful request for help with language issues. I think Sling looks like an excellent remote repository for a mixture of structured and unstructured data. @Julian I take your point. I think all I really needed was the hello world program to post data in, and get data out. One of the things I really like about Sling (although I haven't got it working yet) is that I can effectively ask for an object graph with one query. Example: I am making a project data repository. My data structure holds data such as software projects, releases, classes, methods. Some fields are mandatory, but many will be freeform. The relationship between these entities is complex. As an example the method setXXX may exist across multiple versions, but perhaps change what it does, so displaying comments and documentation about that method requires business knowledge. As I understand it, in a single query about a method, I can return data about the method, but I can walk the repository tree (I don't have the sling language yet...give me time) and return data about the method, the class that holds it, the releases that the class is in, and the project that the holds the data about the class. Your checklist looks like a training plan. My first plan was to make a plug in that was very chatty: I make a query for each entity, perhaps 20 queries for a screen full of data. This would allow me to gain experience with sling, eclipse plugins etc, and give me something shiny to discuss with potential users. Once I have that working, I will be doing a lot more work to reduce it to (hopefull) one request, at which point I will be using a lot more of the sling tools @Bertrand Thanks for the slingbucks example, I'll start with that and if I get stuck move onto CRX. @All Once again thank you for the assistance On Fri, Jul 8, 2011 at 12:41 PM, Bertrand Delacretaz bdelacre...@apache.org wrote: On Fri, Jul 8, 2011 at 1:31 PM, Julian Sedding jsedd...@gmail.com wrote: ...Typically when working with Sling you don't access it via HTTP a lot. Rather you work within Sling. I.e. you write scripts that run within an authenticated request (which typically originates from a browser). I believe that getting inside Sling can be a little tricky at the beginning and that's where CRX with its tooling can certainly help Though our samples, like the Slingbucks one, [1] will show you how to combine java and scripting code to create applications with Sling. -Bertrand [1] http://svn.apache.org/repos/asf/sling/trunk/samples/slingbucks
Re: Beginners question with Sling.
On Fri, Jul 8, 2011 at 8:51 AM, sam lee skyn...@gmail.com wrote: Why don't you use Jackrabbit via DavEx or RMI? http://wiki.apache.org/jackrabbit/RemoteAccess DavEX and RMI are both fairly heavyweight. IIUC, the use case is similar to remote logging where simple data is posted from lots of clients to a central repository in a stateless fashion. Sling is well suited to this use case. I don't think Sling is a remote repository. That's true to some extent (in that Sling isn't a repository), but Sling is a good toolset for building HTTP services to access a repository remotely. The default GET and POST servlets provide most of what one might need and additional servlets or scripts can be created as neeeded. I'm not sure what you meant by a mixture of structured and unstructured data. Have you looked at other databases such as CouchDB or MongoDB? IIUC, neither CouchDB nor MongoDB provide anything approaching the security requirements something like this would require. And, like DavEX or RMI to Jackrabbit, you're accessing the datastore using a fairly low-level API. Sling enables you to easily create higher level HTTP-based APIs (and provides its own in the form of the default servlets). Justin On Fri, Jul 8, 2011 at 8:05 AM, Phil Rice phil.rice.erud...@googlemail.comwrote: @Sam Lee Why do you want to access through Java My client is going to be an Eclipse Plugin. In practice I will probably use Scala or Clojure, but I didn't want to pollute my pitiful request for help with language issues. I think Sling looks like an excellent remote repository for a mixture of structured and unstructured data. @Julian I take your point. I think all I really needed was the hello world program to post data in, and get data out. One of the things I really like about Sling (although I haven't got it working yet) is that I can effectively ask for an object graph with one query. Example: I am making a project data repository. My data structure holds data such as software projects, releases, classes, methods. Some fields are mandatory, but many will be freeform. The relationship between these entities is complex. As an example the method setXXX may exist across multiple versions, but perhaps change what it does, so displaying comments and documentation about that method requires business knowledge. As I understand it, in a single query about a method, I can return data about the method, but I can walk the repository tree (I don't have the sling language yet...give me time) and return data about the method, the class that holds it, the releases that the class is in, and the project that the holds the data about the class. Your checklist looks like a training plan. My first plan was to make a plug in that was very chatty: I make a query for each entity, perhaps 20 queries for a screen full of data. This would allow me to gain experience with sling, eclipse plugins etc, and give me something shiny to discuss with potential users. Once I have that working, I will be doing a lot more work to reduce it to (hopefull) one request, at which point I will be using a lot more of the sling tools @Bertrand Thanks for the slingbucks example, I'll start with that and if I get stuck move onto CRX. @All Once again thank you for the assistance On Fri, Jul 8, 2011 at 12:41 PM, Bertrand Delacretaz bdelacre...@apache.org wrote: On Fri, Jul 8, 2011 at 1:31 PM, Julian Sedding jsedd...@gmail.com wrote: ...Typically when working with Sling you don't access it via HTTP a lot. Rather you work within Sling. I.e. you write scripts that run within an authenticated request (which typically originates from a browser). I believe that getting inside Sling can be a little tricky at the beginning and that's where CRX with its tooling can certainly help Though our samples, like the Slingbucks one, [1] will show you how to combine java and scripting code to create applications with Sling. -Bertrand [1] http://svn.apache.org/repos/asf/sling/trunk/samples/slingbucks
Re: Beginners question with Sling.
On Fri, Jul 8, 2011 at 7:31 AM, Julian Sedding jsedd...@gmail.com wrote: Hi Phil Typically when working with Sling you don't access it via HTTP a lot. How do you figure? Seem to me that Sling applications are almost always accessed via HTTP. Justin Rather you work within Sling. I.e. you write scripts that run within an authenticated request (which typically originates from a browser). I believe that getting inside Sling can be a little tricky at the beginning and that's where CRX with its tooling can certainly help. Assuming you know roughly what Jackrabbit/JCR is, the first steps I recommend are: * understand resource resolution[0]: how does Sling map URL paths to Sling resources * understand script resolution[1]: in Sling you address content, the content knows where to find its rendering script(s) via the sling:resourceType property * once you understand these two concepts, you can look at the FileSystem Provider[2], which allows you to map a filesystem path into Sling's resource tree. This can be helpful for editing rendering scripts outside the repository, which is easier without more sophisticated tooling. Hope that helps more than it confuses ;) Regards Julian [0] http://sling.apache.org/site/url-decomposition.html [1] http://dev.day.com/content/ddc/blog/2008/07/cheatsheet.html [2] http://sling.apache.org/site/downloads.cgi - download FileSystem Provider bundle and install in /system/console/bundles On Fri, Jul 8, 2011 at 1:09 PM, sam lee skyn...@gmail.com wrote: Out of curiosity, why are you using Java and access Sling through HTTP? If you really like Java, you can create an OSGi bundle and deploy the bundle to Sling (felix, /system/console). You can put Servlets and other useful utilities in the bundle. And, you can access the repository directly without going through HTTP, but through JCR or Sling API. On Fri, Jul 8, 2011 at 6:43 AM, Phil Rice phil.rice.erud...@googlemail.comwrote: Thanks for the help Alex. Unfortunately that is one of the things that has changed in the new API. Its no longer a method available from the parameters. However the advice to follow the test framework was very good and the following now works. I can rip this apart and reduce to to the minimum working, which I will post for the benefit of anyone else trying to do this. DefaultHttpClient httpClient = new DefaultHttpClient(); RequestExecutor executor = new RequestExecutor(httpClient); String nodeName = slingNode1; ListNameValuePair formParams = Arrays.NameValuePair asList(new BasicNameValuePair(param1, value1), new BasicNameValuePair(param2, value2)); UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, UTF-8); System.out.println(executor.execute(requestBuilder.buildPostRequest(nodeName).withEntity(entity).withCredentials(admin, admin)).getContent()); System.out.println(executor.execute(requestBuilder.buildGetRequest(nodeName + .json)).getContent()); Once again thanks for all the help, and I look forward to seeing some of you in September at Berlin. Phil On Fri, Jul 8, 2011 at 10:19 AM, Alexander Klimetschek aklim...@adobe.comwrote: On 08.07.11 10:39, Phil Rice phil.rice.erud...@googlemail.com wrote: DefaultHttpClient client = new DefaultHttpClient(); client.getCredentialsProvider().setCredentials(new AuthScope(localhost, 8080), new UsernamePasswordCredentials(admin, admin)); I guess you need to use preemptive auth: client.getParams().setAuthenticationPreemptive(true); http://hc.apache.org/httpclient-3.x/authentication.html Regards, Alex -- Alexander Klimetschek Developer // Adobe (Day) // Berlin - Basel
Re: Beginners question with Sling.
Hi Phil, On Fri, Jul 8, 2011 at 4:15 PM, Phil Rice phil.rice.erud...@googlemail.com wrote: ...Although I came to Sling for the Restful interface, there are a few of features that Sling adds to Jackrabbit that I like: 1: It looks as though Sling would deal with the schema changing across time issue: The support for multiple renderers, and for those renderers to be quite sophisticated looks as though I can ask for resource.oldVersion0, resource.oldVersion1 or resource.json, and have the correct values presented to me. 2: I hope to be able to use the Sling rendering to reduce the chatter between client and server... IMO this matches the general philosophy of Sling very well, so it looks like it's worth for you to hang in there! -Bertrand
RE: Beginners question with Sling.
I agree, it sounds like Sling will work for what you need. Personally I first was interested in using the JCR, and after learning that, Sling was very easy to pick up. I would definitely recommend getting some sort of JCR explorer so you can get a feel of how a jcr repository works, looks and feels. There are open source projects or you can use Day's developer product. I've never tried it, but from what I've ready by default you should be able to connect to a sling repo via jcr explorer using rmi://localhost:1099/jackrabbit. For your use, keep in mind that in sling you don't have to use the default post handler. You can create a custom POST.jsp that will handle the post request however you want. All you need to do is set the parent's resource type. -Original Message- From: Bertrand Delacretaz [mailto:bdelacre...@apache.org] Sent: Friday, July 08, 2011 10:35 AM To: users@sling.apache.org Subject: Re: Beginners question with Sling. Hi Phil, On Fri, Jul 8, 2011 at 4:15 PM, Phil Rice phil.rice.erud...@googlemail.com wrote: ...Although I came to Sling for the Restful interface, there are a few of features that Sling adds to Jackrabbit that I like: 1: It looks as though Sling would deal with the schema changing across time issue: The support for multiple renderers, and for those renderers to be quite sophisticated looks as though I can ask for resource.oldVersion0, resource.oldVersion1 or resource.json, and have the correct values presented to me. 2: I hope to be able to use the Sling rendering to reduce the chatter between client and server... IMO this matches the general philosophy of Sling very well, so it looks like it's worth for you to hang in there! -Bertrand
Re: Beginners question with Sling.
You can use /system/sling.js
It has Sling.removeContent() and Sling.getContent().
You just need to implement Sling.createContent(), Sling.updateContent(),
Sling.query() using xhr.
Then you have something like couchdb.
I don't think sling has RESTful API reference. It would be useful.
On Thu, Jul 7, 2011 at 8:57 AM, Eric Norman eric.d.nor...@gmail.com wrote:
Hi Phil,
It looks like your form inputs are missing the name attribute. Try
something like this:
html
headtitleTesting/title/head
body
form action=http://localhost:8080/newNode1; method=post
label for=name1Name1/label input type=text id=name1 *
name=name1*
value=Value1 /br /
label for=name2Name3/label input type=text id=name2 *
name=name2*
value=Value2 /br /
label for=name3Name4/label input type=text id=name3 *
name=name3*
value=Value3 /br /
label for=name4Name5/label input type=text id=name4 *
name=name4*
value=Value4 /br /
buttonSubmit/button
/form
/body
/html
Also, take a look at the documentation of the sling post servlet bundle @
http://sling.apache.org/site/manipulating-content-the-slingpostservlet-servletspost.html
for
some examples of content manipulation.
Regards,
Eric
On Thu, Jul 7, 2011 at 12:56 AM, Phil Rice
phil.rice.erud...@googlemail.com
wrote:
Thanks for the swift reply
- I'll raise a bug about Sling in 15 minutes as soon as I can make a
unit test to capture it.
- I'm hoping someone can point me to a tutorial or reference materials
for ESP. Playing with javascript through reflection is hard work!
- Thanks for the idea of running Sling in the same OSGI container. I
suspect that won't work for crowd sourcing (you want one central
repository), but I think it would be an excellent way to learn how
everything ties together
- I was puzzled that PUT was the wrong method. As I understand it PUT
is
the mechanism to create or replace in REST. However I replaced the
call
to
a post, and I just get internal server error 500s with nothing
appearing
in
the logs. I will chase that down when I have sorted out the next point:
- Assuming that there is a problem in my understanding in what is going
on, I reduced to the simplest thing that could wrong and produced the
following HTML page
html
headtitleTesting/title/head
body
form action=http://localhost:8080/newNode1; method=post
label for=name1Name1/label input type=text id=name1
value=Value1 /br /
label for=name2Name3/label input type=text id=name2
value=Value2 /br /
label for=name3Name4/label input type=text id=name3
value=Value3 /br /
label for=name4Name5/label input type=text id=name4
value=Value4 /br /
buttonSubmit/button
/form
/body
/html
My hope is that when I click the button this would create newNode1 with
attributes name1 = Value1 etc. And indeed (after logging in) it created
newNode1. However when I examine the node created using the url
http://localhost:8080/newNode1.json I find the following page:
{jcr:primaryType:nt:unstructured}
However if I use
curl -u admin:admin -Fname1=value1 -Fname2=value2
http://localhost:8080/newNodeQ1
And surf to http://localhost:8080/newNodeQ1.json I find
{name2:value2,jcr:primaryType:nt:unstructured,name1:value1}
I would appreciate some advice on how to get the HTML to work similar to
curl
Thanks again for the help
---
My software stack is:
- Windows 7 64 bit
- JDK1.6.0_24
- Eclipse Indigo Release build 20110615-0604
- I am using jar org.apache.sling.launchpad.base.jar, which I
downloaded earlier this week.
- I am running the jar using Eclipse using only defaults (no VM
arguments, no program arguments). The main method is from
class org.apache.sling.launchpad.app.Main
The console output from sling is
07.07.2011 07:54:18.570 *INFO* [main] Setting sling.home=sling (default)
07.07.2011 07:54:18.572 *INFO* [main] Starting Sling in sling
(C:\Users\Phil\workspace\Sling\sling)
07.07.2011 07:54:18.620 *INFO* [main] Checking launcher JAR in folder
sling
07.07.2011 07:54:18.640 *INFO* [main] Existing launcher is up to date,
using
it: 2.3.0 (org.apache.sling.launchpad.base.jar)
07.07.2011 07:54:18.642 *INFO* [main] Loading launcher class
org.apache.sling.launchpad.base.app.MainDelegate from
org.apache.sling.launchpad.base.jar
07.07.2011 07:54:18.662 *INFO* [main] Starting launcher ...
07.07.2011 07:54:18.666 *INFO* [main] HTTP server port: 8080
07.07.2011 07:54:20.736 *INFO* [main] Startup completed
On Wed, Jul 6, 2011 at 11:02 PM, Justin Edelson
jus...@justinedelson.com
wrote:
On Jul 6, 2011, at 5:16 PM, Phil Rice
phil.rice.erud...@googlemail.com
wrote:
Hello everyone.
Hi
I have just downloaded Sling, and am very impressed with it. I am
planning
on using it in conjunction with an Eclipse plugin to
Re: Beginners question with Sling.
On Thu, Jul 7, 2011 at 3:03 PM, sam lee skyn...@gmail.com wrote: ...I don't think sling has RESTful API reference. It would be useful you're right, OTOH Sling has an extensive integration test suite which uses its HTTP interfaces, so you can learn a lot by looking at the code under [1]. If someone feels like contributing to this, it would be cool to adapt and extend what I started to do in Stanbol [2] to generate RESTful API documentation based on annotated integration tests. -Bertrand [1] http://svn.apache.org/repos/asf/sling/trunk/launchpad/integration-tests [2] See https://issues.apache.org/jira/browse/STANBOL-15 and generateDocumentation in http://svn.apache.org/repos/asf/incubator/stanbol/trunk/integration-tests/src/test/java/org/apache/stanbol/enhancer/it/StatelessEngineTest.java
RE: Beginners question with Sling.
You could probably use their tools to create bundles then just deploy the
bundles to your sling instance.
Just need to say that using their tools in this manor may violate the
developer edition's license agreement, I don't know. I'd still suggest
looking into the product to help learn the language, but make sure you
carefully read the license agreement before actually deploying bundles to
sling.
-Original Message-
From: Mark Herman
Sent: Thursday, July 07, 2011 9:04 AM
To: users@sling.apache.org
Subject: RE: Beginners question with Sling.
In reference to ESP vs JSP:
You may be able to use Day CRX (now Adobe) documentation as a resource.
They have a series of blogs called CRX Gems. Some are product specific but
most are really just taking advantage of sling.
http://dev.day.com/content/ddc/blog.html?_charset_=ISO-8859-1query=crx+gems;
main_entries_start=15blog=searchy=0x=0
Page back into newer topics as well.
Here are some links that I have stashed away that may be of interest to you:
http://dev.day.com/content/ddc/blog/2010/07/learning_about_espv.html
https://cwiki.apache.org/SLING/scripting-variables.html
http://www.lucamasini.net/Home/sling-and-cq5/accessing-relational-data-as-sli
ng-restful-urls
I recently looked into whether to go with ESP or JSP and decided to go with
JSP for the following reasons:
- JSP is more standard, easier for others to jump on a project
- As you have found documentation for ESP is scarce.
- I wasn't able to find any advantages of using ESP besides that the common
sling objects are provided for you. In JSP you just have to include a taglib
and call the call sling:define objects.
- It seems the people who write/use the product tend to use JSP more and are
starting to shy away from ESP.
- IDE support should be a bit better with JSP
I don't think there is anything wrong with ESP, but it just seems like it
doesn't have any major advantage make it a must have.
A couple of discussions I have found:
http://www.mail-archive.com/users@sling.apache.org/msg01105.html
http://tech.groups.yahoo.com/group/Day-Communique/message/2464
Sorry I can't help with your issues. As you probably have guessed most my
experience is with Day/Adobe's product, so I suggest you may want to get a
license for a developer edition of CRX. It's free (last i checked), and is
basically a jackrabbit repository with sling on top plus their tools. They
have an Eclipse ide with debugging, a node browser, and a web based ide.
It's very easy to install, although you will need to register for a free
license. Also note, eclipse ide is a separate download. You could probably
use their tools to create bundles then just deploy the bundles to your sling
instance.
Good luck.
-Original Message-
From: Phil Rice [mailto:phil.rice.erud...@googlemail.com]
Sent: Thu 7/7/2011 3:56 AM
To: users@sling.apache.org
Subject: Re: Beginners question with Sling.
Thanks for the swift reply
- I'll raise a bug about Sling in 15 minutes as soon as I can make a
unit test to capture it.
- I'm hoping someone can point me to a tutorial or reference materials
for ESP. Playing with javascript through reflection is hard work!
- Thanks for the idea of running Sling in the same OSGI container. I
suspect that won't work for crowd sourcing (you want one central
repository), but I think it would be an excellent way to learn how
everything ties together
- I was puzzled that PUT was the wrong method. As I understand it PUT is
the mechanism to create or replace in REST. However I replaced the call
to
a post, and I just get internal server error 500s with nothing appearing
in
the logs. I will chase that down when I have sorted out the next point:
- Assuming that there is a problem in my understanding in what is going
on, I reduced to the simplest thing that could wrong and produced the
following HTML page
html
headtitleTesting/title/head
body
form action=http://localhost:8080/newNode1; method=post
label for=name1Name1/label input type=text id=name1
value=Value1 /br /
label for=name2Name3/label input type=text id=name2
value=Value2 /br /
label for=name3Name4/label input type=text id=name3
value=Value3 /br /
label for=name4Name5/label input type=text id=name4
value=Value4 /br /
buttonSubmit/button
/form
/body
/html
My hope is that when I click the button this would create newNode1 with
attributes name1 = Value1 etc. And indeed (after logging in) it created
newNode1. However when I examine the node created using the url
http://localhost:8080/newNode1.json I find the following page:
{jcr:primaryType:nt:unstructured}
However if I use
curl -u admin:admin -Fname1=value1 -Fname2=value2
http://localhost:8080/newNodeQ1
And surf to http://localhost:8080/newNodeQ1.json I find
{name2:value2,jcr:primaryType:nt:unstructured,name1:value1}
I would appreciate some advice on how to get the HTML to work similar to
curl
Thanks again for the help
Re: Beginners question with Sling.
On Jul 6, 2011, at 5:16 PM, Phil Rice phil.rice.erud...@googlemail.com wrote:
Hello everyone.
Hi
I have just downloaded Sling, and am very impressed with it. I am planning
on using it in conjunction with an Eclipse plugin to crowd source
information about open source projects.
Sounds interesting. Are you able to reuse code between the server side and
client side as both Sling and Eclipse are OSGi based?
I am having the usual teething problems that I get whenever I use an open
source product, and I am hoping to get some assistance. I have spent three
days getting going, so I have tried quite a few combinations.
Some general information for you getting going with sling in 15 minutes
was very helpful. I have a version of Sling built from the source code using
Maven, and a second which is the standalone Jar. On both of them the
following curl command didn't work:
curl -u admin:admin -Fsling:resourceType=foo/bar -Ftitle=some
title http://localhost:8080/content/mynode
I had to replace it with:
curl -u admin:admin -Fsling:resourceType=foo/bar -Ftitle=some
title http://localhost:8080/mynode
This should have worked. Can you file a bug report?
At the moment my Sling-fu is weak and I am not sure if this is some
configuration problem.
---
I am now at the point at which I feel the master of Sling (pride comes
before a fall) using Curl, so I have moved to Java. I have tried a number of
Java libraries include the Apache HttpClient, http-unit and Rest-assured. I
am now at the point at which I can get information out of Sling that I put
in with Curl, but I am unable to programatically add it. Specifically I can
create the node, but the attributes do not appear. Fairly obviously I am
missing some critical configuration
So I have the following questions:
- ESP looks very nice. Where can I find information on how to use it. I
have found some samples using it, but have not been very successful in
finding tutorials / reference material.
- What is the Java side client software that you recommend for use with
Sling, and do you have any example code?
The majority of the Sling integration test suite is written with Apache
HttpClient 3.x. That's a good point if reference.
- Can you advise why the following code does not set param1=value1,
param2=value2?
You're doing a PUT. I'm assuming you are using the default servlets and the
functionality which accepts form parameters and sets node properties from them
is in the default POST servlet. Of course, you're free to write your own
servlet which accepts PUTs.
HTH,
Justin
import org.apache.http.*;
public class PopulateRepository {
public static void main(String[] args) throws Exception {
BasicCredentialsProvider credentialsProvider = new
BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new
UsernamePasswordCredentials(admin, admin));
DefaultHttpClient client = new DefaultHttpClient();
client.setCredentialsProvider(credentialsProvider);
String nodeName = newNodeName;
ListNameValuePair formParams = Arrays.NameValuePair asList(new
BasicNameValuePair(param1, value1), new BasicNameValuePair(param2,
value2));
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, UTF-8);
HttpPut action = new HttpPut(http://localhost:8080/; + nodeName);
HttpResponse response = client.execute(action);
}}
Thanks for making such an interesting product
