Re: [appengine-java] Re: Referencing projects
The .NET approach is different than the Java approach. It's unnecessary to break this project up. I personally do not think you gain anything with this approach other than additional complexity. That being said, Eclipse is infinitely flexible. You can probably set it up so that on a build, it creates a JAR file and places it in WEB-INF/lib. On Thu, Jan 21, 2010 at 12:18 PM, Maurits mvanbeuse...@themobilebrand.comwrote: Hi Ikai (and others), Thank you very much for your reply, I appreciate it. Although I am not yet satisfied (sorry ;) ). The thing is I am not just learning Java, I got the language covered, I am a seasoned C# programmer and have some experience with Java already. Now I am trying to build a serious application and would like split up the project into several projects (as I would do in .NET). The thing is that I have all the code ready and it works as long as I manually copy the JAR files into the WEB-INF/lib folder. I will go check out the link you supplied, but if you or any one else can provide some more insight I would really appreciate it. Thanks Maurits On Jan 21, 8:29 pm, Ikai L (Google) ika...@google.com wrote: Hi there! If you're learning Java, it's probably overkill to create 4 different projects, even for different layers of the application. It's probably enough to simply create different packages and sort through them that way. For development, you can get away with putting the JAR files in your Java classpath. Another thing you can do is to use a popular Java build tool, Ant, to do this manually. It's a great opportunity to learn Ant! Here are the bits related to App Engine: http://code.google.com/appengine/docs/java/tools/ant.html http://code.google.com/appengine/docs/java/tools/ant.htmlThat being said, I don't think it's necessary to break things up into four projects. It's easy - almost trivial - to do so later down the line if your packages are set up right. On Thu, Jan 21, 2010 at 1:42 AM, Maurits mvanbeuse...@themobilebrand.comwrote: Hi all, I am an experienced .NET developer but new to JAVA and Eclipse. I am currently experimenting with JAVA and the GAE with plans to start making more use of the GAE since I really like what is offered (Google keep up the good work ;)). However I am running into a problem, I would like to build an application using multiple layers (currently a Presentation layer, Service layer, Business layer and a Data layer). My presentation layer is a GAE project created using the Eclipse plug-in, the other layers are all normal JAVA projects I created in the same workspace (so I have 4 separate projects). Now I managed to get everything compile correctly by referencing all projects with each other using the Java Build Path - Projects dialog window. However when I run the application I run into the problem that the Presentation layer cannot find the classed from my Service layer project. I figured out that I need to manually copy the output classes from the Service (and others) layer into the WEB-INF/lib folder to get it working (preferably packed into a JAR file). My question is, can this be somehow automated? I read some information about using an ANT script to do so, but since I am a bit spoiled with Visual Studio (who does this automatically when I make the reference) I have no clue on how to start, I don't even know how to automatically pack the class files from the Service, Business and Data layers into a JAR file. Is there someone who can get me started? Many thanks, Maurits -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.comgoogle-appengine-java%2B unsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- Ikai Lan Developer Programs Engineer, Google App Engine -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- Ikai Lan Developer Programs Engineer, Google App Engine -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group,
[appengine-java] Re: Referencing projects
Hi Ikai, Thanks again for the reply. The thing is that I want the Service layer to be a facade library which (potentially) can be used in several projects. I assumed it would be useful to compile it into a separate JAR file so it can easily be reused and I don't have to extract the packages first. That is the reason I wanted to separate stuff into different projects, does that make sense or am I thinking completely wrong here. -- Maurits On Jan 21, 9:34 pm, Ikai L (Google) ika...@google.com wrote: The .NET approach is different than the Java approach. It's unnecessary to break this project up. I personally do not think you gain anything with this approach other than additional complexity. That being said, Eclipse is infinitely flexible. You can probably set it up so that on a build, it creates a JAR file and places it in WEB-INF/lib. On Thu, Jan 21, 2010 at 12:18 PM, Maurits mvanbeuse...@themobilebrand.comwrote: Hi Ikai (and others), Thank you very much for your reply, I appreciate it. Although I am not yet satisfied (sorry ;) ). The thing is I am not just learning Java, I got the language covered, I am a seasoned C# programmer and have some experience with Java already. Now I am trying to build a serious application and would like split up the project into several projects (as I would do in .NET). The thing is that I have all the code ready and it works as long as I manually copy the JAR files into the WEB-INF/lib folder. I will go check out the link you supplied, but if you or any one else can provide some more insight I would really appreciate it. Thanks Maurits On Jan 21, 8:29 pm, Ikai L (Google) ika...@google.com wrote: Hi there! If you're learning Java, it's probably overkill to create 4 different projects, even for different layers of the application. It's probably enough to simply create different packages and sort through them that way. For development, you can get away with putting the JAR files in your Java classpath. Another thing you can do is to use a popular Java build tool, Ant, to do this manually. It's a great opportunity to learn Ant! Here are the bits related to App Engine: http://code.google.com/appengine/docs/java/tools/ant.html http://code.google.com/appengine/docs/java/tools/ant.htmlThat being said, I don't think it's necessary to break things up into four projects. It's easy - almost trivial - to do so later down the line if your packages are set up right. On Thu, Jan 21, 2010 at 1:42 AM, Maurits mvanbeuse...@themobilebrand.comwrote: Hi all, I am an experienced .NET developer but new to JAVA and Eclipse. I am currently experimenting with JAVA and the GAE with plans to start making more use of the GAE since I really like what is offered (Google keep up the good work ;)). However I am running into a problem, I would like to build an application using multiple layers (currently a Presentation layer, Service layer, Business layer and a Data layer). My presentation layer is a GAE project created using the Eclipse plug-in, the other layers are all normal JAVA projects I created in the same workspace (so I have 4 separate projects). Now I managed to get everything compile correctly by referencing all projects with each other using the Java Build Path - Projects dialog window. However when I run the application I run into the problem that the Presentation layer cannot find the classed from my Service layer project. I figured out that I need to manually copy the output classes from the Service (and others) layer into the WEB-INF/lib folder to get it working (preferably packed into a JAR file). My question is, can this be somehow automated? I read some information about using an ANT script to do so, but since I am a bit spoiled with Visual Studio (who does this automatically when I make the reference) I have no clue on how to start, I don't even know how to automatically pack the class files from the Service, Business and Data layers into a JAR file. Is there someone who can get me started? Many thanks, Maurits -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2B unsubscr...@googlegroups.comgoogle-appengine-java%2B unsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- Ikai Lan Developer Programs Engineer, Google App Engine -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to
[appengine-java] Re: Referencing projects
Hi Maurits,
I've achieved what you're looking for, but it wasn't easy. If anyone
has a better solution, I'm all ears.
First of all, to do it manually, you can Right-click any project in
Eclipse and Export it to a JAR file - which can then be saved in your
GAE lib/ folder. But, this has to be done each time you make a
change.
I'm currently using Maven in Eclipse to manage and build my projects
(this copies those external JAR files each time) and then the maven-
antrun-plugin to call the GAE command line scripts that run/upload my
project. Now that it's set up, it is a single click to run/upload,
despite being dependent on several other Eclipse Projects and 3rd
Party plugins.
This website was the most helpful in setting that up:
http://twelves.blogspot.com/2009/04/google-appengine-maven-pom.html
Most notably, I did not use the maven-gae-plugin that is mentioned
frequently around the interwebs - I was never able to get it working
properly.
I've pasted the applicable bits of my Maven POM file below - that
might be helpful. This is all based on MacOS commands, but I believe
Windows is similar. If you choose not to use Maven, the applicable
ANT bits will still be helpful.
Good Luck!
Jake
project xmlns=http://maven.apache.org/POM/4.0.0; xmlns:xsi=http://
www.w3.org/2001/XMLSchema-instance
xsi:schemaLocation=http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd;
groupIdorg.example/groupId
artifactIdproject/artifactId
packagingwar/packaging
properties
gae.sdk.location/Applications/eclipse/plugins/
com.google.appengine.eclipse.sdkbundle.1.3.0_1.3.0.v200912141120/
appengine-java-sdk-1.3.0/gae.sdk.location
/properties
repositories
repository
idMVNSearch/id
nameMVNSearch/name
urlhttp://www.mvnsearch.org/maven2/url
/repository
repository
idDataNucleus/id
urlhttp://www.datanucleus.org/downloads/maven2//url
/repository
/repositories
dependencies
dependency
groupIdcom.google.appengine/groupId
artifactIdappengine-api-1.0-labs/artifactId
version1.3.0/version
/dependency
dependency
groupIdcom.google.appengine.orm/groupId
artifactIddatanucleus-appengine/artifactId
version1.0.4.1/version
exclusions
exclusion
artifactIddatanucleus-core/artifactId
groupIdorg.datanucleus/groupId
/exclusion
/exclusions
/dependency
dependency
groupIdorg.datanucleus/groupId
artifactIddatanucleus-core/artifactId
version1.1.6/version
/dependency
dependency
groupIdorg.datanucleus/groupId
artifactIddatanucleus-jpa/artifactId
version1.1.5/version
/dependency
dependency
groupIdorg.example/groupId
artifactIdotherproject/artifactId
version0.0.1-SNAPSHOT/version
/dependency
/dependencies
build
finalName${project.artifactId}/finalName
resources
resource
filteringfalse/filtering
directorysrc/main/resources/directory
/resource
resource
filteringfalse/filtering
directorysrc/main/java/directory
includes
include**/include
/includes
excludes
exclude**/*.java/exclude
/excludes
/resource
resource
directorysrc/main/webapp//directory
includes
include**/*.xml/include
/includes
/resource
/resources
plugins
plugin
groupIdorg.apache.maven.plugins/groupId
artifactIdmaven-war-plugin/artifactId
configuration
[appengine-java] Re: Referencing projects
Hi Jake,
Thank you very much for your reply, this is exactly what I was looking
for. And since I am also using on MacOS it should be really easy to
setup with the information you gave ;).
Cheers, Maurits
On Jan 21, 8:03 pm, Jake jbrooko...@cast.org wrote:
Hi Maurits,
I've achieved what you're looking for, but it wasn't easy. If anyone
has a better solution, I'm all ears.
First of all, to do it manually, you can Right-click any project in
Eclipse and Export it to a JAR file - which can then be saved in your
GAE lib/ folder. But, this has to be done each time you make a
change.
I'm currently using Maven in Eclipse to manage and build my projects
(this copies those external JAR files each time) and then the maven-
antrun-plugin to call the GAE command line scripts that run/upload my
project. Now that it's set up, it is a single click to run/upload,
despite being dependent on several other Eclipse Projects and 3rd
Party plugins.
This website was the most helpful in setting that
up:http://twelves.blogspot.com/2009/04/google-appengine-maven-pom.html
Most notably, I did not use the maven-gae-plugin that is mentioned
frequently around the interwebs - I was never able to get it working
properly.
I've pasted the applicable bits of my Maven POM file below - that
might be helpful. This is all based on MacOS commands, but I believe
Windows is similar. If you choose not to use Maven, the applicable
ANT bits will still be helpful.
Good Luck!
Jake
project xmlns=http://maven.apache.org/POM/4.0.0;
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance;
xsi:schemaLocation=http://maven.apache.org/POM/4.0.0http://maven.apache.org/maven-v4_0_0.xsd;
groupIdorg.example/groupId
artifactIdproject/artifactId
packagingwar/packaging
properties
gae.sdk.location/Applications/eclipse/plugins/
com.google.appengine.eclipse.sdkbundle.1.3.0_1.3.0.v200912141120/
appengine-java-sdk-1.3.0/gae.sdk.location
/properties
repositories
repository
idMVNSearch/id
nameMVNSearch/name
urlhttp://www.mvnsearch.org/maven2/url
/repository
repository
idDataNucleus/id
urlhttp://www.datanucleus.org/downloads/maven2//url
/repository
/repositories
dependencies
dependency
groupIdcom.google.appengine/groupId
artifactIdappengine-api-1.0-labs/artifactId
version1.3.0/version
/dependency
dependency
groupIdcom.google.appengine.orm/groupId
artifactIddatanucleus-appengine/artifactId
version1.0.4.1/version
exclusions
exclusion
artifactIddatanucleus-core/artifactId
groupIdorg.datanucleus/groupId
/exclusion
/exclusions
/dependency
dependency
groupIdorg.datanucleus/groupId
artifactIddatanucleus-core/artifactId
version1.1.6/version
/dependency
dependency
groupIdorg.datanucleus/groupId
artifactIddatanucleus-jpa/artifactId
version1.1.5/version
/dependency
dependency
groupIdorg.example/groupId
artifactIdotherproject/artifactId
version0.0.1-SNAPSHOT/version
/dependency
/dependencies
build
finalName${project.artifactId}/finalName
resources
resource
filteringfalse/filtering
directorysrc/main/resources/directory
/resource
resource
filteringfalse/filtering
directorysrc/main/java/directory
includes
include**/include
/includes
excludes
exclude**/*.java/exclude
/excludes
/resource
resource
directorysrc/main/webapp//directory
includes
include**/*.xml/include
/includes
