Re: Generators in GWT 2.6.0.

[Łukasz Bączek]

I modified the code:

 @Override
    public String generate(TreeLogger logger, GeneratorContext context, 
String typeName) throws UnableToCompleteException {
        JClassType classType;
        String r = null;
        try {
            classType = context.getTypeOracle().getType(typeName);
            SourceWriter src = getSourceWriter(classType, context, logger);
src.println("public void test(){}");
            src.commit(logger);
            if (src != null) {
               r  = typeName + "Generated";
            } else {
                r = null;
            }
        } catch (NotFoundException e) {
            e.printStackTrace();
        }
        return r;
    }
but it is still an Error:

GWT Compiling client-side code.
Compiling module org.yournamehere.Main
   Computing all possible rebind results for 
'com.google.gwt.user.client.ui.Button'
      Rebinding com.google.gwt.user.client.ui.Button
         Invoking generator pl.cba.lukaszbaczek.rttiClassGWT.rttiGenerator
            [ERROR] Generator 
'pl.cba.lukaszbaczek.rttiClassGWT.rttiGenerator' threw an exception 
while rebinding 'com.google.gwt.user.client.ui.Button'
java.lang.NullPointerException
    at 
pl.cba.lukaszbaczek.rttiClassGWT.rttiGenerator.generate(rttiGenerator.java:31)
    at 
com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40) 
at 
com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)
    at 
com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:676)
    at 
com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:41)
    at 
com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:79)
    at 
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:276)
    at 
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:265)
    at 
com.google.gwt.dev.DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(DistillerRebindPermutationOracle.java:91)
    at 
com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleGwtCreate(UnifyAst.java:387)
    at 
com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleMagicMethodCall(UnifyAst.java:465)
    at 
com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:255)
    at 
com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:244)
    at 
com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:117)
    at 
com.google.gwt.dev.jjs.ast.JCastOperation.traverse(JCastOperation.java:65)
    at 
com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:117)
    at 
com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:48)
    at 
com.google.gwt.dev.jjs.ast.JModVisitor$ListContextImmutable.traverse(JModVisitor.java:170)
    at 
com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemoveImmutable(JModVisitor.java:336)
    at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:83)
    at 
com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:138)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:134)
    at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:82)
    at 
com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
    at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:449)
    at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:418)
    at 
com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
    at com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:940)
    at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:665)
    at 
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:672)
    at 
com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:34)
    at com.google.gwt.dev.Precompile.precompile(Precompile.java:271)
    at com.google.gwt.dev.Precompile.precompile(Precompile.java:223)
    at com.google.gwt.dev.Precompile.precompile(Precompile.java:139)
    at com.google.gwt.dev.Compiler.run(Compiler.java:167)
    at com.google.gwt.dev.Compiler.run(Compiler.java:132)
    at com.google.gwt.dev.Compiler$1.run(Compiler.java:99)
    at 
com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
    at 
com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
    at com.google.gwt.dev.Compiler.main(Compiler.java:106)
   [ERROR] Errors in 'org/yournamehere/client/MainEntryPoint.java'
      [ERROR] Line 32: Failed to resolve 
'com.google.gwt.user.client.ui.Button' via deferred binding
C:\Users\Łukasz\Documents\NetBeansProjects\xxx\nbproject\build-gwt.xml:331: 
The following error occurred while executing this line:
C:\Users\Łukasz\Documents\NetBeansProjects\xxx\nbproject\build-gwt.xml:480: 
Java returned: 1
BUILD FAILED (total time: 18 seconds)

RG
Łukasz

W dniu 11.11.2014 o 12:41, Thomas Broyer pisze:
Your getSourceWriter method can explicitly return 'null', and you 
don't check for 'null' after you call it.

On Tuesday, November 11, 2014 3:24:17 AM UTC+1, Łukasz Bączek wrote:

    W dniu 11.11.2014 o 02:03, Jens pisze:
    Put the generator outside of your <source> path so that the gwt compiler 
does not try to compile it to javascript.
    You were right.

    Now I changed the path and the generator is working but there is
    another problem

    public class rttiGenerator extends Generator {

        @Override
        public String generate(TreeLogger logger, GeneratorContext
    context, String typeName) throws UnableToCompleteException {
            JClassType classType;
            try {
                classType = context.getTypeOracle().getType(typeName);
                SourceWriter src = getSourceWriter(classType, context,
    logger);
    *src.println("public void test(){}"); *
                src.commit(logger);
                return typeName + "Generated";
            } catch (NotFoundException e) {
                e.printStackTrace();
            }
            return null;
        }

        public SourceWriter getSourceWriter(JClassType classType,
                GeneratorContext context, TreeLogger logger) {
            String packageName = "pl.cba.lukaszbaczek.client";
            String simpleName = classType.getSimpleSourceName() +
    "Generated";
            ClassSourceFileComposerFactory composer = new
    ClassSourceFileComposerFactory(
                    packageName, simpleName);
            composer.addImport("com.google.gwt.user.client.ui.Button");
            composer.setSuperclass("Button");
            PrintWriter printWriter = context.tryCreate(logger,
    packageName,
                    simpleName);
            if (printWriter == null) {
                return null;
            } else {
                SourceWriter sw = composer.createSourceWriter(context,
    printWriter);
                return sw;
            }
        }
    }

    GWT Compiling client-side code.
    Compiling module org.yournamehere.Main
       Computing all possible rebind results for
    'com.google.gwt.user.client.ui.Button'
          Rebinding com.google.gwt.user.client.ui.Button
             Invoking generator
    pl.cba.lukaszbaczek.rttiClassGWT.rttiGenerator
                [ERROR] Generator
    'pl.cba.lukaszbaczek.rttiClassGWT.rttiGenerator' threw an
    exception while rebinding 'com.google.gwt.user.client.ui.Button'
    java.lang.NullPointerException
        at
    
pl.cba.lukaszbaczek.rttiClassGWT.rttiGenerator.generate(rttiGenerator.java:30)
        at
    
com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)
        at
    
com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:676)
        at
    com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:41)
        at
    
com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:79)
        at
    
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:276)
        at
    
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:265)
        at
    
com.google.gwt.dev.DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(DistillerRebindPermutationOracle.java:91)
        at
    
com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleGwtCreate(UnifyAst.java:387)
        at
    
com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleMagicMethodCall(UnifyAst.java:465)
        at
    
com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:255)
        at
    com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:244)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
        at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:117)
        at
    com.google.gwt.dev.jjs.ast.JCastOperation.traverse(JCastOperation.java:65)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
        at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:117)
        at
    
com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:48)
        at
    
com.google.gwt.dev.jjs.ast.JModVisitor$ListContextImmutable.traverse(JModVisitor.java:170)
        at
    
com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemoveImmutable(JModVisitor.java:336)
        at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:83)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
        at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:138)
        at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:134)
        at
    com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:82)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
        at
    com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:449)
        at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:418)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
        at
    com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
        at
    com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:940)
        at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:665)
        at
    
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:672)
        at
    
com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:34)
        at com.google.gwt.dev.Precompile.precompile(Precompile.java:271)
        at com.google.gwt.dev.Precompile.precompile(Precompile.java:223)
        at com.google.gwt.dev.Precompile.precompile(Precompile.java:139)
        at com.google.gwt.dev.Compiler.run(Compiler.java:167)
        at com.google.gwt.dev.Compiler.run(Compiler.java:132)
        at com.google.gwt.dev.Compiler$1.run(Compiler.java:99)
        at
    com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
        at
    
com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
        at com.google.gwt.dev.Compiler.main(Compiler.java:106)
       [ERROR] Errors in 'org/yournamehere/client/MainEntryPoint.java'
          [ERROR] Line 32: Failed to resolve
    'com.google.gwt.user.client.ui.Button' via deferred binding
    C:\Users\Łukasz\Documents\NetBeansProjects\xxx\nbproject\build-gwt.xml:331:
    The following error occurred while executing this line:
    C:\Users\Łukasz\Documents\NetBeansProjects\xxx\nbproject\build-gwt.xml:480:
    Java returned: 1
    BUILD FAILED (total time: 17 seconds)


    NullPointerException I marked in red, please help

    RG,
    Łukasz

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