plugin with java 8 compiled dependencies cannot be installed

[Frédéric Esnault]

Hi community

I'm developping a new version of one of my plugin, using an upgraded dependency.

The previous version compiles and installs fine in Jira, but this version fails with this trace :

2019-05-23 18:01:11,520 UpmAsynchronousTaskManager:thread-1 ERROR admin 1076x1572x3 143kc40 0:0:0:0:0:0:0:1 /rest/plugins/1.0/installed-marketplace [c.a.plugin.loaders.ScanningPluginLoader] Unable to deploy plugin 'com.atl.jira.tooling.connector' from 'Unit: /Users/phoenix/atl/sources/toolplugin/target/jira/home/plugins/installed-plugins/plugin_7470315700700856865_connector-6.7.0-SNAPSHOT.jar (1558627269000)'.
2019-05-23 18:01:11,520 UpmAsynchronousTaskManager:thread-1 ERROR admin 1076x1572x3 143kc40 0:0:0:0:0:0:0:1 /rest/plugins/1.0/installed-marketplace [c.a.plugin.loaders.ScanningPluginLoader] Because of the following exception:
com.atlassian.plugin.PluginParseException: Unable to scan for host components in plugin classes
at com.atlassian.plugin.osgi.factory.transform.stage.HostComponentSpringStage.execute(HostComponentSpringStage.java:67)
at com.atlassian.plugin.osgi.factory.transform.DefaultPluginTransformer.transform(DefaultPluginTransformer.java:140)
at com.atlassian.plugin.osgi.factory.OsgiPluginFactory.createOsgiPluginJar(OsgiPluginFactory.java:329)
at com.atlassian.plugin.osgi.factory.OsgiPluginFactory.create(OsgiPluginFactory.java:231)
at com.atlassian.jira.plugin.MasterPluginFactory.create(MasterPluginFactory.java:73)
...
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:498)
at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:26)
at com.sun.proxy.$Proxy126.installPlugins(Unknown Source)
... 3 filtered
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)
...
at com.atlassian.upm.core.install.AbstractPluginInstallHandler$1.doInTransaction(AbstractPluginInstallHandler.java:139)
at com.atlassian.upm.core.install.AbstractPluginInstallHandler$1.doInTransaction(AbstractPluginInstallHandler.java:134)
....
Caused by: java.io.IOException: Error parsing class file
at com.atlassian.plugin.osgi.util.ClassBinaryScanner.scanClassBinary(ClassBinaryScanner.java:58)
at com.atlassian.plugin.osgi.factory.transform.stage.HostComponentSpringStage.findUsedHostComponents(HostComponentSpringStage.java:193)
at com.atlassian.plugin.osgi.factory.transform.stage.HostComponentSpringStage.execute(HostComponentSpringStage.java:65)
... 90 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 19
at aQute.bnd.osgi.Clazz.parseClassFile(Clazz.java:497)
at aQute.bnd.osgi.Clazz.parseClassFileWithCollector(Clazz.java:486)
at com.atlassian.plugin.osgi.util.ClassBinaryScanner.scanClassBinary(ClassBinaryScanner.java:37)
... 92 more
2019-05-23 18:01:11,526 UpmAsynchronousTaskManager:thread-1 WARN admin 1076x1572x3 143kc40 0:0:0:0:0:0:0:1 /rest/plugins/1.0/installed-marketplace [c.a.u.core.install.DefaultPluginInstallationService] Plugin installation failed: Unknown error, plugin not installed
2019-05-23 18:01:11,526 UpmAsynchronousTaskManager:thread-1 WARN admin 1076x1572x3 143kc40 0:0:0:0:0:0:0:1 /rest/plugins/1.0/installed-marketplace [c.a.u.core.install.DefaultPluginInstallationService] com.atlassian.upm.spi.PluginInstallException: Unknown error, plugin not installed
com.atlassian.upm.spi.PluginInstallException: Unknown error, plugin not installed
at com.atlassian.upm.core.install.AbstractPluginInstallHandler.installArtifact(AbstractPluginInstallHandler.java:122)
at com.atlassian.upm.core.install.JarPluginInstallHandler.installPluginInternal(JarPluginInstallHandler.java:52)
....

 This error seems to be linked to plugins compiled with Java 8 (maven source/target version set to 1.8). If I build previous version for java 1.8, it fails when i try ton install it. If i set target version to 1.7, it works.

But for the new version, even lowering version to 1.7 does not work. I think it's the upgraded dependency that I import with my plugin that must have been compiled for java 8 (or just really using java 8 features, like lambdas).

So my question is, how can I get my plugin to work ? 

Is that related to the bnd tool included in jira that would be too old ? 

I can't believe there is no way to fix this, java 8 is quite old now.

Hoping that some of you have a solution for this, I would really appreciate !