Gitblit does not work with Java 16

[flaix]

My java SDK is v16.

> java --version
java 16.0.1 2021-04-20
Java(TM) SE Runtime Environment (build 16.0.1+9-24)
Java HotSpot(TM) 64-Bit Server VM (build 16.0.1+9-24, mixed mode, sharing)

When start gitblit,log is

[2021-07-27 08:09:15] [info]  Stopping service...
[2021-07-27 08:09:16] [info]  Service stopped.
[2021-07-27 08:09:16] [info]  Run service finished.
[2021-07-27 08:09:16] [info]  Commons Daemon procrun finished
[2021-07-27 08:09:19] [info]  Commons Daemon procrun (1.0.10.0 64-bit) started
[2021-07-27 08:09:19] [info]  Running 'gitblit' Service...
[2021-07-27 08:09:19] [info]  Starting service...
[2021-07-27 08:09:20] [info]  Service started in 1295 ms.

stderr

2021-07-27 08:09:19 Commons Daemon procrun stderr initialized

stdout

2021-07-27 08:09:19 Commons Daemon procrun stdout initialized
2021-07-27 08:09:19 [INFO ] 
  _____  _  _    _      _  _  _
 |  __ \(_)| |  | |    | |(_)| |
 | |  \/ _ | |_ | |__  | | _ | |_
 | | __ | || __|| '_ \ | || || __|  http://gitblit.com
 | |_\ \| || |_ | |_) || || || |_   @gitblit
  \____/|_| \__||_.__/ |_||_| \__|  1.9.1

2021-07-27 08:09:19 [INFO ] Running on Windows Server 2019 (10.0)
2021-07-27 08:09:19 [INFO ] JVM version 16.0.1 (Oracle Corporation)
2021-07-27 08:09:19 [INFO ] Logging initialized @437ms
2021-07-27 08:09:20 [INFO ] Using JCE Unlimited Strength Jurisdiction Policy files
2021-07-27 08:09:20 [INFO ] Setting up HTTPS transport on port 8443
2021-07-27 08:09:20 [INFO ]    certificate alias = localhost
2021-07-27 08:09:20 [INFO ]    keyStorePath   = C:\soft\gitblit-1.9.1\data\serverKeyStore.jks
2021-07-27 08:09:20 [INFO ]    trustStorePath = C:\soft\gitblit-1.9.1\data\serverTrustStore.jks
2021-07-27 08:09:20 [INFO ]    crlPath        = C:\soft\gitblit-1.9.1\data\certs\caRevocationList.crl
2021-07-27 08:09:20 [INFO ] Setting up HTTP transport on port 8090
2021-07-27 08:09:20 [INFO ] Shutdown Monitor listening on port 8081
2021-07-27 08:09:20 [INFO ] jetty-9.2.13.v20150730
2021-07-27 08:09:30 [INFO ] NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
2021-07-27 08:09:30 [WARN ] FAILED o.e.j.w.WebAppContext@45312be2{/,file:/C:/soft/gitblit-1.9.1/data/temp/webapp/,STARTING}{file:/C:/soft/gitblit-1.9.1/gitblit.jar}: java.lang.ExceptionInInitializerError
java.lang.ExceptionInInitializerError
	at com.google.inject.internal.cglib.reflect.$FastClassEmitter.<init>(FastClassEmitter.java:67)
	at com.google.inject.internal.cglib.reflect.$FastClass$Generator.generateClass(FastClass.java:72)
	at com.google.inject.internal.cglib.core.$DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
	at com.google.inject.internal.cglib.core.$AbstractClassGenerator.create(AbstractClassGenerator.java:216)
	at com.google.inject.internal.cglib.reflect.$FastClass$Generator.create(FastClass.java:64)
	at com.google.inject.internal.BytecodeGen.newFastClass(BytecodeGen.java:204)
	at com.google.inject.internal.ProviderMethod$FastClassProviderMethod.<init>(ProviderMethod.java:256)
	at com.google.inject.internal.ProviderMethod.create(ProviderMethod.java:71)
	at com.google.inject.internal.ProviderMethodsModule.createProviderMethod(ProviderMethodsModule.java:275)
	at com.google.inject.internal.ProviderMethodsModule.getProviderMethods(ProviderMethodsModule.java:144)
	at com.google.inject.internal.ProviderMethodsModule.configure(ProviderMethodsModule.java:123)
	at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340)
	at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:349)
	at com.google.inject.AbstractModule.install(AbstractModule.java:122)
	at com.google.inject.servlet.ServletModule.configure(ServletModule.java:52)
	at com.google.inject.AbstractModule.configure(AbstractModule.java:62)
	at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340)
	at com.google.inject.spi.Elements.getElements(Elements.java:110)
	at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:138)
	at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:104)
	at com.google.inject.Guice.createInjector(Guice.java:96)
	at com.google.inject.Guice.createInjector(Guice.java:73)
	at com.google.inject.Guice.createInjector(Guice.java:62)
	at com.gitblit.servlet.GitblitContext.getInjector(GitblitContext.java:127)
	at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:47)
	at com.gitblit.servlet.GitblitContext.contextInitialized(GitblitContext.java:145)
	at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:800)
	at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:444)
	at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:791)
	at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:294)
	at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
	at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
	at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
	at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
	at org.eclipse.jetty.server.Server.start(Server.java:387)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
	at org.eclipse.jetty.server.Server.doStart(Server.java:354)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at com.gitblit.GitBlitServer.start(GitBlitServer.java:465)
	at com.gitblit.GitBlitServer.main(GitBlitServer.java:124)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @3b084709
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
	at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
	at com.google.inject.internal.cglib.core.$ReflectUtils$2.run(ReflectUtils.java:56)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:312)
	at com.google.inject.internal.cglib.core.$ReflectUtils.<clinit>(ReflectUtils.java:46)
	... 43 more
2021-07-27 08:09:30 [INFO ] Started ServerConnector@6ebf0f36{SSL-HTTP/1.1}{0.0.0.0:8443}
2021-07-27 08:09:30 [INFO ] Started ServerConnector@18920cc{HTTP/1.1}{0.0.0.0:8090}
2021-07-27 08:09:30 [WARN ] FAILED org.eclipse.jetty.server.Server@2807bdeb: java.lang.ExceptionInInitializerError
java.lang.ExceptionInInitializerError
	at com.google.inject.internal.cglib.reflect.$FastClassEmitter.<init>(FastClassEmitter.java:67)
	at com.google.inject.internal.cglib.reflect.$FastClass$Generator.generateClass(FastClass.java:72)
	at com.google.inject.internal.cglib.core.$DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
	at com.google.inject.internal.cglib.core.$AbstractClassGenerator.create(AbstractClassGenerator.java:216)
	at com.google.inject.internal.cglib.reflect.$FastClass$Generator.create(FastClass.java:64)
	at com.google.inject.internal.BytecodeGen.newFastClass(BytecodeGen.java:204)
	at com.google.inject.internal.ProviderMethod$FastClassProviderMethod.<init>(ProviderMethod.java:256)
	at com.google.inject.internal.ProviderMethod.create(ProviderMethod.java:71)
	at com.google.inject.internal.ProviderMethodsModule.createProviderMethod(ProviderMethodsModule.java:275)
	at com.google.inject.internal.ProviderMethodsModule.getProviderMethods(ProviderMethodsModule.java:144)
	at com.google.inject.internal.ProviderMethodsModule.configure(ProviderMethodsModule.java:123)
	at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340)
	at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:349)
	at com.google.inject.AbstractModule.install(AbstractModule.java:122)
	at com.google.inject.servlet.ServletModule.configure(ServletModule.java:52)
	at com.google.inject.AbstractModule.configure(AbstractModule.java:62)
	at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340)
	at com.google.inject.spi.Elements.getElements(Elements.java:110)
	at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:138)
	at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:104)
	at com.google.inject.Guice.createInjector(Guice.java:96)
	at com.google.inject.Guice.createInjector(Guice.java:73)
	at com.google.inject.Guice.createInjector(Guice.java:62)
	at com.gitblit.servlet.GitblitContext.getInjector(GitblitContext.java:127)
	at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:47)
	at com.gitblit.servlet.GitblitContext.contextInitialized(GitblitContext.java:145)
	at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:800)
	at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:444)
	at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:791)
	at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:294)
	at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
	at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
	at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
	at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
	at org.eclipse.jetty.server.Server.start(Server.java:387)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
	at org.eclipse.jetty.server.Server.doStart(Server.java:354)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at com.gitblit.GitBlitServer.start(GitBlitServer.java:465)
	at com.gitblit.GitBlitServer.main(GitBlitServer.java:124)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @3b084709
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
	at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
	at com.google.inject.internal.cglib.core.$ReflectUtils$2.run(ReflectUtils.java:56)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:312)
	at com.google.inject.internal.cglib.core.$ReflectUtils.<clinit>(ReflectUtils.java:46)
	... 43 more

When access http://localhost:8090, the browser shows TIMEOUT. This should be gitblit can not working with jave v16.

So, I use gitblit war, with java v16 and Tomcat9, extract gitblit war to tomcat/webapps, it works for me.

Thanks.

Originally posted by @x1244 in #1315 (comment)

[flaix]

A possible work-around would be to set the --illegal-access=permit parameter to the JVM command line.

[luy710]

A possible work-around would be to set the --illegal-access=permit parameter to the JVM command line.

How did you solve it

[flaix]

Who? The OP is running Gitblit as a WAR in a Tomcat application server, where this problem does not manifest.
The posted stack trace is from the stand-alone Gitblit GO version starting up.

[flaix]

The --illegal-access=permit parameter is not going to cut it, because from Java 17 on it is disabled. So as another workaround, the --add-opens option could be employed. Maybe. It helps for startup, to get around problems with Guice by setting it for java.base/java.lang=ALL-UNNAMED. But I found no application for accesses from Lucene when indexing. Which might be solved with dependency updates.
So a fix for this is left for version 1.10 and later.

[flaix]

I am going to close this issue in favour of #1420, because Java 17 is the current LTS release, so that is the one to target for Gitblit.