4 Replies Latest reply on Aug 28, 2017 4:46 AM by lrr

    Roaster: JavaClassSource.getMethods/getMethod returns empty methods

    lrr Newbie

      Hello together.

      I'm trying to add code to existing methods like this:

      final JavaClassSource source = javaResource.getJavaType();
      MethodSource<JavaClassSource> method = source.getMethod(...);
      String body=method.getBody();
      ...
      method.setBody(body+codeToAdd);
      

       

      I try this for 6 different methods. 3 of them are empty, when I call method.getBody(). Also when I print source.getMethods, 3 of them are empty. But when I print source.toString(), all the methods contain the expected code.

        • 1. Re: Roaster: JavaClassSource.getMethods/getMethod returns empty methods
          George Gastaldi Master

          Hi Leonardo,

           

          Are you using Roaster2.20.1.Final? I remember seeing this behavior in older versions when the body is not a compilable Java code.

           

          Can you reproduce it in a test case?

          • 2. Re: Roaster: JavaClassSource.getMethods/getMethod returns empty methods
            lrr Newbie

            Hello George.

            Thanks for your fast response.

            Yes I use org.jboss.forge.addon:core 3.7.2.Final which provides Roaster 2.20.1.Final. I tried to reproduce it in a test, but to do so I had to add

            <dependency>
              <groupId>org.jboss.forge.roaster</groupId>
              <artifactId>roaster-api</artifactId>
              <version>${version.roaster}</version>
            </dependency>
            <dependency>
              <groupId>org.jboss.forge.roaster</groupId>
              <artifactId>roaster-jdt</artifactId>
              <version>${version.roaster}</version>
              <scope>runtime</scope>
            </dependency>
            

            else I got the error:

            java.lang.IllegalStateException: No instances of [org.jboss.forge.roaster.spi.JavaParser] were found on the classpath.

            After I added these dependencies, the test was successful, but without the empty body issue and I couldn't run my plugin in the forge ui anymore:

            java.lang.reflect.InvocationTargetException

                    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

                    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

                    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

                    at java.lang.reflect.Method.invoke(Method.java:498)

                    at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:87)

                    at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42)

                    at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:103)

                    at de.forge.domaintype.NewDomainTypeUICommand_$$_javassist_5edefd33-5fc1-4e62-8c3b-cc9eb0deccef.execute(NewDomainTypeUICommand_$$_javassist_5edefd33-5fc1-4e62-8c3b-cc9eb0deccef.java)

                    at org.jboss.forge.addon.ui.impl.controller.SingleCommandControllerImpl.execute(SingleCommandControllerImpl.java:94)

                    at org.jboss.forge.addon.shell.aesh.CommandAdapter.execute(CommandAdapter.java:97)

                    at org.jboss.forge.addon.shell.aesh.ForgeCommandContainer.executeCommand(ForgeCommandContainer.java:88)

                    at org.jboss.aesh.console.AeshConsoleImpl$AeshConsoleCallbackImpl.execute(AeshConsoleImpl.java:311)

                    at org.jboss.aesh.console.AeshProcess.run(AeshProcess.java:53)

                    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

                    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

                    at java.lang.Thread.run(Thread.java:745)

            Caused by: java.lang.LinkageError: loader constraint violation: when resolving interface method "org.jboss.forge.addon.parser.java.facets.JavaSourceFacet.saveJavaSource(Lorg/jboss/forge/roaster/model/source/JavaSource;)Lorg/jboss/forge/addon/parser/java/resources/JavaResource;" the class loader (instance of org/jboss/modules/ModuleClassLoader) of the current class, de/forge/task/GenerateJavaFileTask, and the class loader (instance of org/jboss/modules/ModuleClassLoader) for the method's defining class, org/jboss/forge/addon/parser/java/facets/JavaSourceFacet, have different Class objects for the type org/jboss/forge/roaster/model/source/JavaSource used in the signature

            • 3. Re: Roaster: JavaClassSource.getMethods/getMethod returns empty methods
              George Gastaldi Master

              That's because your test is not running inside a Furnace container. You need to add the @RunWith(Arquillian.class) annotation to your test class to avoid these errors.

               

              Btw, You don't need to use Forge to use Roaster. The roaster libraries alone should be enough to attempt to reproduce your issue

              • 4. Re: Roaster: JavaClassSource.getMethods/getMethod returns empty methods
                lrr Newbie

                I found the problem now:

                The problem is, that if you have syntax errors in the method you want to read, the return of the JavaClassSource.getBody method will be empty without any error message or logging.