Try on java codec plugin

Reproduce the failure with test_plugin.conf and the Logstash command shown in the issue. Start by examining the JavaCodecExample plugin entry point and the pipeline error reporting undefined method new; done means the Java codec plugin loads and the configuration runs without that error.

Build, package gem, then installed the Java plugin in Logstash
Now, Run Logstash with the Java codec plugin to test:

`echo "foo,bar" | $LS_HOME/bin/logstash -e 'input { java_stdin { codec => java_codec_example } }'

{
"@timestamp" => 2019-11-11T09:08:30.159Z,
"hostname" => "fr-133",
"message" => "foo",
"@version" => "1"
}
{
"@timestamp" => 2019-11-11T09:08:30.159Z,
"hostname" => "fr-133",
"message" => "bar\n",
"@version" => "1"
}
`

Test a config as below:

test_plugin.conf

`
input {
stdin {}
}

output {
stdout {
codec => java_codec_example
}
}`

$LS_HOME/bin/logstash -f test_plugin.conf

Error:
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.headius.backport9.modules.Modules (file:/usr/share/logstash/logstash-core/lib/jars/jruby-complete-9.2.8.0.jar) to field java.io.FileDescriptor.fd
WARNING: Please consider reporting this to the maintainers of com.headius.backport9.modules.Modules
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
Thread.exclusive is deprecated, use Thread::Mutex
WARNING: Could not find logstash.yml which is typically located in $LS_HOME/config or /etc/logstash. You can specify the path using --path.settings. Continuing using the defaults
Could not find log4j2 configuration at path /usr/share/logstash/config/log4j2.properties. Using default config which logs errors to the console
[WARN ] 2019-11-11 09:10:41.173 [LogStash::Runner] multilocal - Ignoring the 'pipelines.yml' file because modules or command line options are specified
[INFO ] 2019-11-11 09:10:41.191 [LogStash::Runner] runner - Starting Logstash {"logstash.version"=>"7.4.2"}
[INFO ] 2019-11-11 09:10:43.820 [Converge PipelineAction::Create

] Reflections - Reflections took 50 ms to scan 1 urls, producing 20 keys and 40 values
[ERROR] 2019-11-11 09:10:44.312 [Converge PipelineAction::Create] agent - Failed to execute action {:action=>LogStash::PipelineAction::Create/pipeline_id:main, :exception=>"Java::JavaLang::IllegalStateException", :message=>"Unable to configure plugins: (NoMethodError) undefined method new' for class org.logstashplugins.JavaCodecExample:Java::JavaClass", :backtrace=>["org.logstash.config.ir.CompiledPipeline.<init>(CompiledPipeline.java:100)", "org.logstash.execution.JavaBasePipelineExt.initialize(JavaBasePipelineExt.java:60)", "org.logstash.execution.JavaBasePipelineExt$INVOKER$i$1$0$initialize.call(JavaBasePipelineExt$INVOKER$i$1$0$initialize.gen)", "org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:837)", "org.jruby.ir.runtime.IRRuntimeHelpers.instanceSuper(IRRuntimeHelpers.java:1156)", "org.jruby.ir.runtime.IRRuntimeHelpers.instanceSuperSplatArgs(IRRuntimeHelpers.java:1143)", "org.jruby.ir.targets.InstanceSuperInvokeSite.invoke(InstanceSuperInvokeSite.java:39)", "usr.share.logstash.logstash_minus_core.lib.logstash.java_pipeline.RUBY$method$initialize$0(/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:26)", "org.jruby.internal.runtime.methods.CompiledIRMethod.call(CompiledIRMethod.java:91)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:90)", "org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:332)", "org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:86)", "org.jruby.RubyClass.newInstance(RubyClass.java:915)", "org.jruby.RubyClass$INVOKER$i$newInstance.call(RubyClass$INVOKER$i$newInstance.gen)", "org.jruby.ir.targets.InvokeSite.invoke(InvokeSite.java:183)", "usr.share.logstash.logstash_minus_core.lib.logstash.pipeline_action.create.RUBY$method$execute$0(/usr/share/logstash/logstash-core/lib/logstash/pipeline_action/create.rb:36)", "usr.share.logstash.logstash_minus_core.lib.logstash.pipeline_action.create.RUBY$method$execute$0$__VARARGS__(/usr/share/logstash/logstash-core/lib/logstash/pipeline_action/create.rb)", "org.jruby.internal.runtime.methods.CompiledIRMethod.call(CompiledIRMethod.java:91)", "org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:90)", "org.jruby.ir.targets.InvokeSite.invoke(InvokeSite.java:183)", "usr.share.logstash.logstash_minus_core.lib.logstash.agent.RUBY$block$converge_state$2(/usr/share/logstash/logstash-core/lib/logstash/agent.rb:326)", "org.jruby.runtime.CompiledIRBlockBody.callDirect(CompiledIRBlockBody.java:136)", "org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:77)", "org.jruby.runtime.Block.call(Block.java:129)", "org.jruby.RubyProc.call(RubyProc.java:295)", "org.jruby.RubyProc.call(RubyProc.java:274)", "org.jruby.RubyProc.call(RubyProc.java:270)", "org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:105)", "java.base/java.lang.Thread.run(Thread.java:834)"]} warning: thread "Converge PipelineAction::Create<main>" terminated with exception (report_on_exception is true): LogStash::Error: Don't know how to handle Java::JavaLang::IllegalStateExceptionforPipelineAction::Create create at org/logstash/execution/ConvergeResultExt.java:109 add at org/logstash/execution/ConvergeResultExt.java:37 converge_state at /usr/share/logstash/logstash-core/lib/logstash/agent.rb:339 [ERROR] 2019-11-11 09:10:44.322 [Agent thread] agent - An exception happened when converging configuration {:exception=>LogStash::Error, :message=>"Don't know how to handle Java::JavaLang::IllegalStateExceptionforPipelineAction::Create", :backtrace=>["org/logstash/execution/ConvergeResultExt.java:109:in create'", "org/logstash/execution/ConvergeResultExt.java:37:in add'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:339:in block in converge_state'"]}
[FATAL] 2019-11-11 09:10:44.374 [LogStash::Runner] runner - An unexpected error occurred! {:error=>#<LogStash::Error: Don't know how to handle Java::JavaLang::IllegalStateException for PipelineAction::Create<main>>, :backtrace=>["org/logstash/execution/ConvergeResultExt.java:109:in create'", "org/logstash/execution/ConvergeResultExt.java:37:in add'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:339:in `block in converge_state'"]}
[ERROR] 2019-11-11 09:10:44.451 [LogStash::Runner] Logstash - java.lang.IllegalStateException: Logstash stopped processing because of an error: (SystemExit) exit