We have a pretty heterogeneous team which works with GWT on Mac, Windows & linux machines. One of our latest commit crashed the automatic build which runs on linux box. The problem is that GWT java source generator fails with NullPointerException at different places with the same configuration inputs, therefore it is very hard to reproduce bug or nail it down.
The only regularity we've found is that it fails at some point when trying to generate client bundles from PNG files. Here are few examples: Case #1 [java] Scanning for additional dependencies: file:/home/bear-z/ work/client/Application/src/com/project/client/common/bundles/ CommonResources.java [java] Computing all possible rebind results for 'com.project.client.common.bundles.CommonResources' [java] Rebinding com.project.client.common.bundles.CommonResources [java] Invoking com.google.gwt.dev.javac.standardgeneratorcont...@72af7016 [java] [ERROR] Generator 'com.google.gwt.resources.rebind.context.InlineClientBundleGenerator' threw threw an exception while rebinding 'com.project.client.common.bundles.CommonResources' [java] java.lang.NullPointerException [java] at com.google.gwt.resources.rebind.context.InlineResourceContext.deploy(InlineResourceContext.java: 40) [java] at com.google.gwt.resources.rebind.context.AbstractResourceContext.deploy(AbstractResourceContext.java: 97) [java] at com.google.gwt.resources.rg.ImageResourceGenerator.maybeDeploy(ImageResourceGenerator.java: 369) [java] at com.google.gwt.resources.rg.ImageResourceGenerator.createFields(ImageResourceGenerator.java: 176) [java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.createFieldsAndAssignments(AbstractClientBundleGenerator.java: 328) [java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.createFieldsAndAssignments(AbstractClientBundleGenerator.java: 385) [java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.generate(AbstractClientBundleGenerator.java: 245) [java] at com.google.gwt.dev.javac.StandardGeneratorContext.runGenerator(StandardGeneratorContext.java: 418) [java] at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java: 38) [java] at com.google.gwt.dev.shell.StandardRebindOracle $Rebinder.tryRebind(StandardRebindOracle.java:108) [java] at com.google.gwt.dev.shell.StandardRebindOracle $Rebinder.rebind(StandardRebindOracle.java:54) [java] at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java: 154) [java] at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java: 143) [java] at com.google.gwt.dev.Precompile $DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(Precompile.java: 317) [java] at com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.doFindAdditionalTypesUsingRebinds(WebModeCompilerFrontEnd.java: 95) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.process(AbstractCompiler.java:200) [java] at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:444) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.compile(AbstractCompiler.java:123) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.compile(AbstractCompiler.java:234) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.access$200(AbstractCompiler.java:109) [java] at com.google.gwt.dev.jdt.AbstractCompiler.compile(AbstractCompiler.java: 522) [java] at com.google.gwt.dev.jdt.BasicWebModeCompiler.getCompilationUnitDeclarations(BasicWebModeCompiler.java: 112) [java] at com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.getCompilationUnitDeclarations(WebModeCompilerFrontEnd.java: 47) [java] at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java: 430) [java] at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java: 32) [java] at com.google.gwt.dev.Precompile.precompile(Precompile.java:522) [java] at com.google.gwt.dev.Precompile.precompile(Precompile.java:414) [java] at com.google.gwt.dev.Compiler.run(Compiler.java:201) [java] at com.google.gwt.dev.Compiler$1.run(Compiler.java: 152) [java] at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:87) [java] at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java: 81) [java] at com.google.gwt.dev.Compiler.main(Compiler.java:159) Fails at com.google.gwt.resources.rebind.context.InlineClientBundleGenerator Case #2 [java] [ERROR] Errors in 'file:/home/bear-z/work/client/ Application/src/com/project/client/common/bundles/ CommonResources.java' [java] [ERROR] Line 13: Failed to resolve 'com.project.client.common.bundles.CommonResources' via deferred binding [java] Scanning for additional dependencies: file:/home/bear-z/ work/client/Application/src/com/project/client/contacts/bundles/ ContactsResources.java [java] Computing all possible rebind results for 'com.project.client.contacts.bundles.ContactsResources' [java] Rebinding com.project.client.contacts.bundles.ContactsResources [java] Invoking com.google.gwt.dev.javac.standardgeneratorcont...@72af7016 [java] [ERROR] Generator 'com.google.gwt.resources.rebind.context.StaticClientBundleGenerator' threw threw an exception while rebinding 'com.project.client.contacts.bundles.ContactsResources' [java] java.lang.NullPointerException [java] at com.google.gwt.dev.util.Util.computeStrongName(Util.java:166) [java] at com.google.gwt.dev.util.Util.computeStrongName(Util.java:141) [java] at com.google.gwt.resources.rg.ImageBundleBuilder.assimilate(ImageBundleBuilder.java: 627) [java] at com.google.gwt.resources.rg.ImageResourceGenerator.prepare(ImageResourceGenerator.java: 235) [java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.initAndPrepare(AbstractClientBundleGenerator.java: 556) [java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.initAndPrepare(AbstractClientBundleGenerator.java: 582) [java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.generate(AbstractClientBundleGenerator.java: 204) [java] at com.google.gwt.dev.javac.StandardGeneratorContext.runGenerator(StandardGeneratorContext.java: 418) [java] at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java: 38) [java] at com.google.gwt.dev.shell.StandardRebindOracle $Rebinder.tryRebind(StandardRebindOracle.java:108) [java] at com.google.gwt.dev.shell.StandardRebindOracle $Rebinder.rebind(StandardRebindOracle.java:54) [java] at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java: 154) [java] at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java: 143) [java] at com.google.gwt.dev.Precompile $DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(Precompile.java: 317) [java] at com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.doFindAdditionalTypesUsingRebinds(WebModeCompilerFrontEnd.java: 95) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.process(AbstractCompiler.java:200) [java] at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:444) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.compile(AbstractCompiler.java:123) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.compile(AbstractCompiler.java:234) [java] at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox $CompilerImpl.access$200(AbstractCompiler.java:109) [java] at com.google.gwt.dev.jdt.AbstractCompiler.compile(AbstractCompiler.java: 522) [java] at com.google.gwt.dev.jdt.BasicWebModeCompiler.getCompilationUnitDeclarations(BasicWebModeCompiler.java: 112) [java] at com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.getCompilationUnitDeclarations(WebModeCompilerFrontEnd.java: 47) [java] at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java: 430) [java] at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java: 32) [java] at com.google.gwt.dev.Precompile.precompile(Precompile.java:522) [java] at com.google.gwt.dev.Precompile.precompile(Precompile.java:414) [java] at com.google.gwt.dev.Compiler.run(Compiler.java:201) [java] at com.google.gwt.dev.Compiler$1.run(Compiler.java: 152) [java] at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:87) [java] at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java: 81) [java] at com.google.gwt.dev.Compiler.main(Compiler.java:159) Fails at com.google.gwt.resources.rebind.context.StaticClientBundleGenerator We are using GWT 2.0.4 and tried to compile on a) fedora 13 x86_64 / Both sun Java 1.6.0_16 & java-1.6.0- openjdk-1.6.0.0-42.b18.fc13.x86_64 b) Ubuntu 10.04 x86 / Both sun Java 1.6.0_16 & OpenJDK Server VM (16.0-b13) for linux-x86 I believe that problem is somewhere deep inside Java/GWT internals, related to low level memory/threads handling because of following 1) it compiles like a charm on Windows & Mac boxes 2) it is not regular, i.e. the same code fails at different places during compilation Is there anyone who have experienced something similar on linux? 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