Gretty does not work with Java 9

[boris-petrov]

The stack trace after running gradle farmStart:

Exception in thread "main" java.lang.NullPointerException: Cannot invoke method getText() on null object
        at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)
        at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:48)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
        at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:35)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
        at org.akhikhl.gretty.Runner.initLogback(Runner.groovy:65)
        at org.akhikhl.gretty.Runner$initLogback.callStatic(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:56)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:194)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:206)
        at org.akhikhl.gretty.Runner.run(Runner.groovy:115)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210)
        at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.call(PogoMetaMethodSite.java:71)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
        at org.akhikhl.gretty.Runner.main(Runner.groovy:44)
Exception in thread "Thread-69" org.gradle.process.internal.ExecException: Process 'command '/usr/lib/jvm/java-9-jdk/bin/java'' finished with non-zero exit value 1
        at org.gradle.process.internal.DefaultExecHandle$ExecResultImpl.assertNormalExitValue(DefaultExecHandle.java:382)
        at org.gradle.process.internal.DefaultJavaExecAction.execute(DefaultJavaExecAction.java:31)
        at org.gradle.api.internal.file.DefaultFileOperations.javaexec(DefaultFileOperations.java:182)
        at org.gradle.api.internal.project.DefaultProject.javaexec(DefaultProject.java:1066)
        at org.gradle.api.internal.project.DefaultProject.javaexec(DefaultProject.java:1061)
        at org.gradle.api.Project$javaexec$11.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
        at org.akhikhl.gretty.DefaultLauncher.javaExec(DefaultLauncher.groovy:89)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
        at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
        at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:384)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022)
        at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:166)
        at org.akhikhl.gretty.LauncherBase$_launchThread_closure4.doCall(LauncherBase.groovy:256)
        at org.akhikhl.gretty.LauncherBase$_launchThread_closure4.doCall(LauncherBase.groovy)
        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:564)
        at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
        at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
        at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022)
        at groovy.lang.Closure.call(Closure.java:414)
        at groovy.lang.Closure.call(Closure.java:408)
        at groovy.lang.Closure.run(Closure.java:495)
        at java.base/java.lang.Thread.run(Thread.java:844)

Or am I doing something wrong?

[heartsword2017]

Yep, I also found the same issue. On my windows machine, I have java 9 and it's not working. On my mac which I had java 8 installed, it works.

updates: I tried java 8 on my windows machine but still no luck

updates NO.2: Rebuilt the app and refreshed all my dependencies and it works with java 8 :)

[henrik242]

@akhikhl Do you have a roadmap on JDK9 compatibility?

[maurizziof]

I'm having the exact same issue, has someone found a way or workaround to fix it?

[rahultongia]

Same issue. Any update regarding fix?

[sreejithp]

I'm also facing the same issue.This is something all face when they try to migrate to 9

[javabrett]

Note that compile-on-JDK9 support is going to require some code-changes due to http://openjdk.java.net/jeps/260 hiding some internal JDK APIs and sun.* internal packages and classes currently imported by Gretty e.g. https://github.com/akhikhl/gretty/blob/master/libs/gretty-runner-jetty7/src/main/java/org/akhikhl/gretty/FilteringClassLoader.java#L12 .

[boris-petrov]

For all future readers - this has been fixed in a new fork of Gretty - https://github.com/gretty-gradle-plugin/gretty - thanks to @javabrett!