Re: GWT 2.8.0 OOM Error on compilation

Without seeing the project, it'd be hard to guess, so a few quick notes:

 * ControlFlowAnalyzer is run as part of generating SOYC output, which is going to cost something and be entirely unnecessary for a dev build - arguably even inaccurate to the point of being counterproductive to even look at it (as it would be showing you why your app is so big... when you deliberately are building with draftCompile). Turn off SOYC/compileReport/etc, it doesn't make sense for this build.

 * GWT 2.8.0 is pretty old - you might not be able to update all the way to latest, but maybe a short step or two to see if it resolves something? (2.8.2, 2.9.0, etc)

 * What other details can you share - what args besides -draftCompile are you passing, and roughly how big is your application (in terms of Java LoC or JS output)? Also, can you confirm how you're running the compile, and how you are passing -Xmx36g (in case you're accidentally passing it to the build tool and not to GWT itself)?

On Monday, February 9, 2026 at 12:32:57 PM UTC-6 AFK wrote:

Hey guys, Whenever i compile my GWT project, i get an OOM error:

Compiling module x Compiling 1 permutation [ERROR] OutOfMemoryError: Increase heap size or lower gwt.jjs.maxThreads java.lang.OutOfMemoryError: Java heap space at com.google.gwt.thirdparty.guava.common.collect.Iterables.concat(Iterables.java:495) at com.google.gwt.thirdparty.guava.common.collect.Iterables.concat(Iterables.java:434) at com.google.gwt.dev.jjs.ast.JMethod.getOverriddenMethodsIncludingSelf(JMethod.java:579) at com.google.gwt.dev.jjs.ast.JMethod.canBeReferencedExternally(JMethod.java:85) at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer$RescueVisitor.rescue(ControlFlowAnalyzer.java:626) at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer$RescueVisitor.visit(ControlFlowAnalyzer.java:371) at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:265) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:118) at com.google.gwt.dev.jjs.ast.JExpressionStatement.traverse(JExpressionStatement.java:42) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:146) at com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemove(JVisitor.java:168) at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:92) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:139) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:135) at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:83) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122) at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:786) at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:778) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122) at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer$RescueVisitor.rescue(ControlFlowAnalyzer.java:618) at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer$RescueVisitor.visit(ControlFlowAnalyzer.java:371) at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer$RescueVisitor.visit(ControlFlowAnalyzer.java:478) at com.google.gwt.dev.jjs.ast.js.JsniMethodRef.traverse(JsniMethodRef.java:69) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:146) at com.google.gwt.dev.jjs.ast.JVisitor.acceptImmutable(JVisitor.java:154) at com.google.gwt.dev.jjs.ast.js.JsniMethodBody.traverse(JsniMethodBody.java:136) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127) [ERROR] Out of memory; to increase the amount of memory, use the -Xmx flag at startup (java -Xmx128M ...) [ERROR] Unrecoverable exception, shutting down com.google.gwt.core.ext.UnableToCompleteException: (see previous log entries) at com.google.gwt.dev.ThreadedPermutationWorkerFactory$ThreadedPermutationWorker.compile(ThreadedPermutationWorkerFactory.java:56) at com.google.gwt.dev.PermutationWorkerFactory$Manager$WorkerThread.run(PermutationWorkerFactory.java:74) at java.lang.Thread.run(Thread.java:750) [ERROR] Not all permutation were compiled , completed (0/1)

my project is kinda old, using jars, and compiling in cmd.

I'm giving the compiler 36GB ram, compiling for only firefox, using draftCompile and much more, but nothing is working.

I'm also fairly new to GWT, and i'm really wondering how did the dev working on this specific project before me could compile it.

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