java.lang.IllegalArgumentException when running server

[mohkale]

I'm on meghanada 1.2.1 and emacs GNU Emacs 27.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.17, cairo version 1.17.3) of 2020-04-20.

Here's the full server log:

WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.
[INFO ][Main      :  55] use java home: /usr/lib/jvm/java-13-openjdk
[INFO ][Main      :  56] use java runtime: OpenJDK Runtime Environment 13.0.2+8
[INFO ][Main      :  60] use java vm: OpenJDK 64-Bit Server VM 13.0.2+8
[INFO ][Main      : 155] Meghanada-Server Version:1.2.1-7362fa3
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.nustaq.serialization.FSTClazzInfo (file:/home/mohkale/.dotfiles/editors/emacs/var/meghanada/meghanada-1.2.1.jar) to field java.lang.String.value
WARNING: Please consider reporting this to the maintainers of org.nustaq.serialization.FSTClazzInfo
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO ][Session   : 194] load project from cache. projectRoot:/home/mohkale/programming/repos/com2109-assignment01
[INFO ][EmacsServe: 364] zpage tracez handler http://localhost:43797/tracez
[INFO ][EmacsServe: 370] Start server Listen localhost port:44325
[INFO ][EmacsServe: 391] client connected
[INFO ][CacheEvent:  75] start analyze sources ...
[ERROR][Project   : 334] Catching
java.lang.IllegalArgumentException: error: invalid source release: 14
	at com.sun.tools.javac.main.Arguments.error(Arguments.java:904) ~[jdk.compiler:?]
	at com.sun.tools.javac.main.Arguments.doProcessArgs(Arguments.java:383) ~[jdk.compiler:?]
	at com.sun.tools.javac.main.Arguments.processArgs(Arguments.java:347) ~[jdk.compiler:?]
	at com.sun.tools.javac.main.Arguments.init(Arguments.java:246) ~[jdk.compiler:?]
	at com.sun.tools.javac.api.JavacTool.getTask(JavacTool.java:185) ~[jdk.compiler:?]
	at com.sun.tools.javac.api.JavacTool.getTask(JavacTool.java:119) ~[jdk.compiler:?]
	at com.sun.tools.javac.api.JavacTool.getTask(JavacTool.java:68) ~[jdk.compiler:?]
	at meghanada.analyze.JavaAnalyzer.runAnalyzeAndCompile(JavaAnalyzer.java:151) ~[meghanada-1.2.1.jar:?]
	at meghanada.analyze.JavaAnalyzer.analyzeAndCompile(JavaAnalyzer.java:101) ~[meghanada-1.2.1.jar:?]
	at meghanada.analyze.JavaAnalyzer.analyzeAndCompile(JavaAnalyzer.java:79) ~[meghanada-1.2.1.jar:?]
	at meghanada.project.Project.compileJava(Project.java:319) ~[meghanada-1.2.1.jar:?]
	at meghanada.project.gradle.GradleProject.compileJava(GradleProject.java:513) ~[meghanada-1.2.1.jar:?]
	at meghanada.project.gradle.GradleProject.compileJava(GradleProject.java:503) ~[meghanada-1.2.1.jar:?]
	at meghanada.session.subscribe.CacheEventSubscriber.lambda$analyze$3(CacheEventSubscriber.java:80) ~[meghanada-1.2.1.jar:?]
	at meghanada.config.Config.timeItF(Config.java:135) [meghanada-1.2.1.jar:?]
	at meghanada.session.subscribe.CacheEventSubscriber.analyze(CacheEventSubscriber.java:76) [meghanada-1.2.1.jar:?]
	at meghanada.session.subscribe.CacheEventSubscriber.on(CacheEventSubscriber.java:38) [meghanada-1.2.1.jar:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
	at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?]
	at meghanada.com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:87) [meghanada-1.2.1.jar:?]
	at meghanada.com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:144) [meghanada-1.2.1.jar:?]
	at meghanada.com.google.common.eventbus.Subscriber$1.run(Subscriber.java:72) [meghanada-1.2.1.jar:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
	at java.lang.Thread.run(Thread.java:830) [?:?]
[WARN ][CacheEvent:  94] compile message  error: invalid source release: 14
[INFO ][Config    : 139] analyzed and compiled. elapsed:352.9 ms
[INFO ][CacheEvent: 101] class index size:2176 total elapsed:380.5 ms
[INFO ][Config    : 202] memory usage (used/total/max): 35.00MB / 154.00MB / 1976.00MB
[INFO ][CacheEvent: 106] Ready
[INFO ][CacheEvent:  68] create class index ... read 12 jars. elapsed:1.716 s

and here's the output from java --version:

openjdk 13.0.2 2020-01-14
OpenJDK Runtime Environment (build 13.0.2+8)
OpenJDK 64-Bit Server VM (build 13.0.2+8, mixed mode)

[mopemope]

@mohkale Perhaps, the source compatibility settings are incorrect. Check your settings.

[mohkale]

Sorry, I'm not much of a java dev, how would I do that?

[mohkale]

So evidently it was a source compatibility setting issue. I didn't set a default value for java.sourceCompatibility in build.gradle.kts and it seems to have defaulted to 14 for some reason 😓. Apologies for the bogus issue, thnx for pointing me in the right direction.