I was only able to fix the error above *ecj *from from *apache-jsp* per the
suggestions here <https://github.com/gwtproject/gwt/issues/9757>
```
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>apache-jsp</artifactId>
<version>${jetty.version}</version>
<exclusions>
<exclusion>
<groupId>org.eclipse.jdt</groupId>
<artifactId>ecj</artifactId>
</exclusion>
</exclusions>
</dependency>
```
On Sunday, February 26, 2023 at 5:14:04 PM UTC+3 Alaa Humaidat wrote:
> Actually, after a few tries, I started getting compilation errors on all
> lines containing logical operators. For example,
> ```
> public void onClick(ClickEvent event) {
> * if ( ! selectedOptionsList.isEmpty()) {*
> repOptfPanel.clear();
> for (String str : selectedOptionsList) {
> Label label = new Label(str);
>
> label.getElement().getStyle().setProperty("float", "left");
>
> label.getElement().getStyle().setProperty("margin", "3px");
> repOptfPanel.add(label);
> }
>
> ReprocessOptionsDialog.this.hide();
> }
> }
> ```
> doesn't compile due to the following error:
> ```
> [ERROR] An internal compiler exception occurred
> com.google.gwt.dev.jjs.InternalCompilerException: Unexpected operator for
> unary expression
> at
> com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:2377)
> at
> org.eclipse.jdt.internal.compiler.ast.UnaryExpression.traverse(UnaryExpression.java:353)
> at
> org.eclipse.jdt.internal.compiler.ast.IfStatement.traverse(IfStatement.java:329)
> at
> org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:411)
> at
> org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1765)
> at
> org.eclipse.jdt.internal.compiler.ast.QualifiedAllocationExpression.traverse(QualifiedAllocationExpression.java:693)
> at
> org.eclipse.jdt.internal.compiler.ast.MessageSend.traverse(MessageSend.java:1167)
> at
> org.eclipse.jdt.internal.compiler.ast.ConstructorDeclaration.traverse(ConstructorDeclaration.java:708)
> at
> org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1831)
> at
> org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1683)
>
> at
> com.google.gwt.dev.jjs.impl.GwtAstBuilder.processImpl(GwtAstBuilder.java:3969)
> at
> com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:4007)
> at
> com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:128)
> at
> com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:322)
> at
> org.eclipse.jdt.internal.compiler.Compiler.processCompiledUnits(Compiler.java:575)
> at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:475)
> at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
> at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:1020)
> at
> com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:322)
> at
> com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:532)
> at
> com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:464)
> at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:423)
> at com.google.gwt.dev.Precompile.precompile(Precompile.java:210)
> at com.google.gwt.dev.Precompile.precompile(Precompile.java:190)
> at com.google.gwt.dev.Precompile.precompile(Precompile.java:131)
> at com.google.gwt.dev.Compiler.compile(Compiler.java:192)
> at com.google.gwt.dev.Compiler.compile(Compiler.java:143)
> at com.google.gwt.dev.Compiler.compile(Compiler.java:132)
> at com.google.gwt.dev.Compiler$1.run(Compiler.java:110)
> at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
> at
> com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
> at com.google.gwt.dev.Compiler.main(Compiler.java:113)
> [ERROR] at ReprocessProductForm.java(324): *(!
> selectedOptionsList.isEmpty())*
> org.eclipse.jdt.internal.compiler.ast.UnaryExpression
> ```
>
> while the following compiles successfully:
> ```
> public void onClick(ClickEvent event) {
> *if ( selectedOptionsList.isEmpty()) {*
> repOptfPanel.clear();
> for (String str : selectedOptionsList) {
> Label label = new Label(str);
>
> label.getElement().getStyle().setProperty("float", "left");
>
> label.getElement().getStyle().setProperty("margin", "3px");
> repOptfPanel.add(label);
> }
>
> ReprocessOptionsDialog.this.hide();
> }
> }
> ```
>
> The code above used to work fine when compiled using Java 8, GWT 2.10.
> On Friday, February 24, 2023 at 3:02:24 PM UTC+3 Alaa Humaidat wrote:
>
>> Thank you, upgrading to java 11.0.18 fixed the issue, however, I got the
>> following compilation error:
>> ```
>> [ERROR] An internal compiler exception occurred
>> com.google.gwt.dev.jjs.InternalCompilerException: Unexpected operator for
>> EqualExpression
>> at
>> com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:762)
>> at
>> org.eclipse.jdt.internal.compiler.ast.EqualExpression.traverse(EqualExpression.java:995)
>> at
>> org.eclipse.jdt.internal.compiler.ast.IfStatement.traverse(IfStatement.java:329)
>> at
>> org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:437)
>> at
>> org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1699)
>> at
>> com.google.gwt.dev.jjs.impl.GwtAstBuilder.processImpl(GwtAstBuilder.java:3969)
>> at
>> com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:4007)
>> at
>> com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:128)
>> at
>> com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:322)
>> at
>> org.eclipse.jdt.internal.compiler.Compiler.processCompiledUnits(Compiler.java:575)
>> at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:475)
>> at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
>> at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:1020)
>> at
>> com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:322)
>> at
>> com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:532)
>> at
>> com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:464)
>> at
>> com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:423)
>> at com.google.gwt.dev.Precompile.precompile(Precompile.java:210)
>> at com.google.gwt.dev.Precompile.precompile(Precompile.java:190)
>> at com.google.gwt.dev.Precompile.precompile(Precompile.java:131)
>> at com.google.gwt.dev.Compiler.compile(Compiler.java:192)
>> at com.google.gwt.dev.Compiler.compile(Compiler.java:143)
>> at com.google.gwt.dev.Compiler.compile(Compiler.java:132)
>> at com.google.gwt.dev.Compiler$1.run(Compiler.java:110)
>> at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
>> at
>> com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
>> at com.google.gwt.dev.Compiler.main(Compiler.java:113)
>> [ERROR] at Map.java(82): (value != null)
>> org.eclipse.jdt.internal.compiler.ast.EqualExpression
>>
>> ```
>>
>> On Friday, February 24, 2023 at 12:58:21 PM UTC+3 Thomas Broyer wrote:
>>
>>> This looks like a deadlock in JDK classes themselves. Did you try
>>> updating your JDK to the latest version? (11.0.18 AFAICT; 11.0.5 is more
>>> than 3 years old already)
>>>
>>> On Thursday, February 23, 2023 at 3:14:03 PM UTC+1 [email protected]
>>> wrote:
>>>
>>>> I'm working on upgrading an app that uses GWT and embedded jetty
>>>> server from java 8 to java 11. The app was working fine with jetty 9, GWT
>>>> 2.10.0 before the upgrade. After upgrading to java 11- Jetty 11, the
>>>> compilation for GWT got stuck.
>>>>
>>>> I removed all unused dependencies, upgraded existing ones to their
>>>> latest version (compatible with Java11), tried to increase Xmx and Xss for
>>>> the compilation target, and tried to add workers, but nothing worked.
>>>>
>>>> I used `jstack` to check the processes threads, which showed a deadlock
>>>> (result attached).
>>>>
>>>> Below is the ant target I'm using to build GWT:
>>>>
>>>> ```
>>>> <target name="compile.gwt" description="build applications"
>>>> depends="compile">
>>>> <java jvm="${home}/apps64/java11/bin/java" failonerror="true"
>>>> classname="com.google.gwt.dev.Compiler"
>>>> fork="true"
>>>> output="build.log">
>>>> <classpath>
>>>> <path refid="local.class.path"/>
>>>> </classpath>
>>>> <jvmarg line="-Xmx1024M"/>
>>>> <jvmarg line="-Xss16M"/>
>>>> <arg value="-style"/>
>>>> <arg value="DETAILED"/>
>>>> <arg value="-localWorkers"/>
>>>> <arg value="16"/>
>>>> <arg value="-logLevel"/>
>>>> <arg value="DEBUG"/>
>>>> <arg value="-optimize"/>
>>>> <arg value="5"/>
>>>> <arg value="com.automation.core.ds"/>
>>>> </java>
>>>> </target>
>>>> ```
>>>>
>>>> How can I fix that?
>>>>
>>>
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