Using Jsweet to convert an Applet to Java Script. A null pointer exception was thrown during the conversion

[xeccgtt]

We are try to convert an applet to Java Script. A null pointer exception was thrown during the conversion. I obscured our source code file name.

2020-02-24 16:06:09.009 ERROR output:55 - internal transpiler error at Obscured_File_Name.java(315) dumping transpiler's strack trace: [JCMethodDecl] public String getParameter(fin... (Obscured_File_Name.java(315,5)) [JCClassDecl] public class Map extends Exten... (Obscured_File_Name.java(41,1)) ... (Obscured_File_Name.java(22,1)) java.lang.NullPointerException at org.jsweet.transpiler.Java2TypeScriptTranslator.visitMethod(Java2TypeScriptTranslator.java:2175) at org.jsweet.transpiler.Java2TypeScriptTranslator.visitMethod(Java2TypeScriptTranslator.java:2239) at org.jsweet.transpiler.Java2TypeScriptTranslator.visitMethod(Java2TypeScriptTranslator.java:146) at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:898) at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82) at org.jsweet.transpiler.util.AbstractTreeScanner.scan(AbstractTreeScanner.java:269) at org.jsweet.transpiler.util.AbstractTreePrinter.print(AbstractTreePrinter.java:121) at org.jsweet.transpiler.Java2TypeScriptTranslator.visitClass(Java2TypeScriptTranslator.java:1746) at org.jsweet.transpiler.Java2TypeScriptTranslator.visitClass(Java2TypeScriptTranslator.java:146) at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:808) at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82) at org.jsweet.transpiler.util.AbstractTreeScanner.scan(AbstractTreeScanner.java:269) at org.jsweet.transpiler.util.AbstractTreePrinter.print(AbstractTreePrinter.java:121) at org.jsweet.transpiler.Java2TypeScriptTranslator.visitCompilationUnit(Java2TypeScriptTranslator.java:858) at org.jsweet.transpiler.Java2TypeScriptTranslator.visitCompilationUnit(Java2TypeScriptTranslator.java:146) at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:591) at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82) at org.jsweet.transpiler.util.AbstractTreeScanner.scan(AbstractTreeScanner.java:269) at org.jsweet.transpiler.util.AbstractTreePrinter.print(AbstractTreePrinter.java:121) at org.jsweet.transpiler.JSweetTranspiler.generateTsFiles(JSweetTranspiler.java:880) at org.jsweet.transpiler.JSweetTranspiler.java2ts(JSweetTranspiler.java:843) at org.jsweet.transpiler.JSweetTranspiler.transpile(JSweetTranspiler.java:771) at org.jsweet.AbstractJSweetMojo.transpile(AbstractJSweetMojo.java:606) at org.jsweet.JSweetMojo.execute(JSweetMojo.java:43) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:210) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:156) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:956) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) at org.apache.maven.cli.MavenCli.main(MavenCli.java:192) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) 2020-02-24 16:06:10.010 INFO JSweetTranspiler:903 - output file: Obscured_File_Name.ts 2020-02-24 16:06:10.010 INFO JSweetTranspiler:928 - created Obscured_File_Name.ts

[lgrignon]

Hello,

Thanks for reporting.

Which version of JSweet are you using? Could you please provide a small repro project please (repo or zip)?

[lgrignon]

@xeccgtt any news on this?

[xeccgtt]

I have not proceeded any further with jsweet because of the null pointer exception. I tried jsweet about a month ago and I believe we were using the latest version at thattime.

Sincerely

Albert Stark

From: Louis Grignon notifications@github.com Sent: Monday, April 27, 2020 1:21 PM To: cincheo/jsweet jsweet@noreply.github.com Cc: Stark, Albert J albert.stark@bnymellon.com; Mention mention@noreply.github.com Subject: Re: [cincheo/jsweet] Using Jsweet to convert an Applet to Java Script. A null pointer exception was thrown during the conversion (#564)

@xeccgtthttps://clicktime.symantec.com/3AEocw2SmbYn1phXkXAowYA7Vc?u=https%3A%2F%2Fgithub.com%2Fxeccgtt any news on this?

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[lgrignon]

I think this is a JSweet 3 pre release bug which will be fixed soon. I keep it open

[lgrignon]

Hello again @xeccgtt 3.0.0-RC4 has been deployed (and maven plugin is up to date) if you want to give it a shot Warning : if you declare jsweet-core as a dependency, groupId is now <groupId>org.jsweet.v3</groupId>

I hope it will work for you 🤞

[lgrignon]

3.0.0-RC5 is deployed, please test it on this version if you can. groupId is org.jsweet.v3 for almost all artifacts now (please see pom.xml & build.gradle here: https://github.com/cincheo/jsweet-examples)