Paolo Antinori created KARAF-4693:
-------------------------------------
Summary: shell:new issue with class wildcards
Key: KARAF-4693
URL: https://issues.apache.org/jira/browse/KARAF-4693
Project: Karaf
Issue Type: Bug
Components: karaf-shell
Affects Versions: 4.0.6
Reporter: Paolo Antinori
Karaf shell fails if you run this command:
{code:a}=shell:new java.util.ArrayList 2
2016-09-02 11:15:51,525 | ERROR | nsole user karaf | ShellUtil
| 43 - org.apache.karaf.shell.core - 4.0.6 | Exception caught while
executing command
java.lang.IllegalStateException
at
org.apache.karaf.shell.support.converter.GenericType.parametersOf(GenericType.java:161)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.karaf.shell.support.converter.GenericType.[init](GenericType.java:53)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.karaf.shell.support.converter.GenericType.parametersOf(GenericType.java:154)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.karaf.shell.support.converter.GenericType.[init](GenericType.java:53)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.karaf.shell.commands.impl.NewAction.findMatchingConstructors(NewAction.java:167)[41:org.apache.karaf.shell.commands:4.0.6]
at
org.apache.karaf.shell.commands.impl.NewAction.execute(NewAction.java:89)[41:org.apache.karaf.shell.commands:4.0.6]
at
org.apache.karaf.shell.impl.action.command.ActionCommand.execute(ActionCommand.java:83)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:67)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:87)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)[43:org.apache.karaf.shell.core:4.0.6]
at
org.apache.karaf.shell.impl.console.ConsoleSessionImpl.run(ConsoleSessionImpl.java:274)[43:org.apache.karaf.shell.core:4.0.6]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_102]
{code}
The reason for that is not really that it can't handle generics but it the
logic that probe for the best matching constructor, that at some point, in this
class:
https://github.com/apache/karaf/blob/68bef0ced72a3fe192cfe496b3fff654b49b2377/shell/core/src/main/java/org/apache/karaf/shell/support/converter/GenericType.java#L161-L161
sees {{type}} set to {{"? extends E"}} that is not able to handle, thus
throwing the blocking exception.
It's enough to replace that exception with an empty return, to bypass the
failing iteration and have the command to succeed.
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