Re: Running GWT 2.4.0 using JDK 17

[Anjana A]

Hi Colin,

Thanks for the response!
As an initial step I am try to build the GWT SDK jars from source code by 
following the instructions provided in this link - 
https://github.com/gwtproject/gwt?tab=readme-ov-file

With few corrections in GWT.2.4.0 source code was able to build jars 
successfully with JDK 17 and also tried with JDK.1.8 (no code change made) 
by using command ant clean dist-dev with -Dgwt.tools  from CLI as mentioned 
in the above link.  But when I use these generated jars(gwt-dev.jar, 
gwt-user.jar, gwt-servlet.jar, gwt-servlet-deps.jar, 
requestfactory-apt.jar, requestfactory-client.jar, 
requestfactory-server.jar, requestfactory-client+src.jar, 
 requestfactory-server+src.jar, requestfactory-client-src.jar, 
 requestfactory-server-src.jar) into my application, I am getting below 
error-

Error trace-

 [java] [1.573s][info][class,load] 
com.google.gwt.dev.javac.TypeOracleMediator$TypeOracleMediatorResolver 
source: 
file:/scratch/home/aarmugam/SDM_java17/sryadava_Ammolite_linux/nnc/core/ACMEConsole/WEB-INF/lib/gwt-dev.jar
 [java] [1.574s][info][class,load] 
com.google.gwt.dev.javac.CompilationProblemReporter source: 
file:/scratch/home/aarmugam/SDM_java17/sryadava_Ammolite_linux/nnc/core/ACMEConsole/WEB-INF/lib/gwt-dev.jar
 [java] [1.575s][info][class,load] 
java.lang.invoke.LambdaForm$MH/0x7fe964144000 source: 
__JVM_LookupDefineClass__
 [java] [1.575s][info][class,load] 
java.lang.invoke.LambdaForm$MH/0x7fe964144400 source: 
__JVM_LookupDefineClass__
 [java] [1.576s][info][class,load] 
java.lang.invoke.LambdaForm$MH/0x7fe964144800 source: 
__JVM_LookupDefineClass__
 [java] [1.576s][info][class,load] 
java.lang.invoke.LambdaForm$MH/0x7fe964144c00 source: 
__JVM_LookupDefineClass__
 [java]
*[ERROR] Unable to find type 'java.lang.Object'* [java] 
[1.577s][info][class,load] com.google.gwt.dev.util.Messages source: 
file:/scratch/home/aarmugam/SDM_java17/sryadava_Ammolite_linux/nnc/core/ACMEConsole/WEB-INF/lib/gwt-dev.jar
 [java]   *[ERROR] Hint: Check that your module inherits 
'com.google.gwt.core.Core' either directly or indirectly (most often by 
inheriting module 'com.google.gwt.user.User')*
 [java] [1.578s][info][class,load] 
java.util.IdentityHashMap$KeyIterator source: shared objects file
 [java] [1.578s][info][class,load] java.io.RandomAccessFile$1 source: 
shared objects file
 [java] [1.579s][info][class,load] 
java.util.prefs.FileSystemPreferences$10 source: jrt:/java.prefs
 [java] [1.579s][info][class,load] 
java.util.prefs.FileSystemPreferences$12 source: jrt:/java.prefs
 [java] [1.579s][info][class,load] 
java.util.prefs.FileSystemPreferences$11 source: jrt:/java.prefs


I checked many blogs on the similar error where it was mentioned the root 
cause for this issue was because of classpath mistake.  I am running my 
application ant build from CLI and also I have verified that all the 
required jars are present in classpath. Could you please guide me here to 
tackle this issue? Please note I am  also *facing  same issue when I build 
jars with JDK.1.8 without any code change in GWT.2.4.0 source code*.

GWT.2.4.0 source code downloaded from -
 https://github.com/gwtproject/gwt/releases/tag/2.4.0 

tools - https://github.com/gwtproject/tools/ 


Thanks in advance!

Regards,
Anjana 

On Wednesday, January 3, 2024 at 10:25:25 PM UTC+5:30 Colin Alworth wrote:

> (I wrote a longer reply, but Google Groups ate it and never posted it, so 
> apologies for brevity here):
>
> Without more information, it is hard to give a specific answer - are you 
> just hoping to update the Java version and make no changes to the 
> application? It might be that nothing at all needs to be done. If you're 
> using GWT-RPC, you might have no changes to make at all, or you might need 
> an --add-opens jvm arg for a few specific classes (fix to be released in 
> GWT 2.11). 
>
> On the other hand, if you're running the compiler or dev mode on Java 17, 
> other changes are likely needed, due to dependencies that have changed with 
> the Java update.
>
> GWT 2.4.0 was released just over 12 years ago, and was intended to run on 
> Java 6 - even Java 8 will only be ten years old in about two months.
>
> On Wednesday, January 3, 2024 at 8:40:28 AM UTC-6 anjana@gmail.com 
> wrote:
>
>> Hi Team,
>>
>> Due to some business constraints our application is still running on old 
>> GWT.2.4.0 and now we wanted to upgrade java version of our application to 
>> JDK 17.  is it possible to run GWT.2.4.0 on an application which uses JDK 
>> 17? if yes, can you please guide me with the helpful  resources for the 
>> same?
>>
>> Thanks,
>> Anjana
>>
>

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Running GWT 2.4.0 using JDK 17

[Anjana A]

Hi Team,

Due to some business constraints our application is still running on old 
GWT.2.4.0 and now we wanted to upgrade java version of our application to 
JDK 17.  is it possible to run GWT.2.4.0 on an application which uses JDK 
17? if yes, can you please guide me with the helpful  resources for the 
same?

Thanks,
Anjana

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