How to implement java interface in jruby 9.2.7.0

Hi there,
I have a ruby script as follows:

class MyScript
# Import the interface required by the Script snap.
include com.snaplogic.scripting.language.ScriptHook
attr_reader :log, :input, :output, :error
def initialize(log, input, output, error)
@log = log
@input = input
@output = output
@error = error
end

# The "execute()" method is called once when the pipeline is started
# and allowed to process its inputs or just send data to its outputs.
def execute()
    while input.hasNext() do
        begin
            # Read the next document, wrap it in a map and write out the wrapper
            doc = input.next()
            wrapper = {
             "original" => doc
            }
        
            log.info("Executed Ruby script")
            output.write(doc, wrapper)
        
        rescue => e
            log.error("Bad Rublet " + e.message)
            errWrapper = {
                "errMsg" => e.message
            }
            error.write(errWrapper)
        end
    end
    
    
end

end

The Script Snap will look for a ScriptHook object in the “hook”

variable. The snap will then call the hook’s “execute” method.

$hook = MyScript.new($log, $input, $output, $error)

===================================

When I trying to execute it, I am getting this error:

com.snaplogic.api.ExecutionException: (NoMethodError) undefined method hasNext' for nil:NilClass at com.snaplogic.snaps.script.CommonExecute.execute(CommonExecute.java:148) at com.snaplogic.cc.snap.common.SnapRunnableImpl.executeSnap(SnapRunnableImpl.java:791) at com.snaplogic.cc.snap.common.SnapRunnableImpl.execute(SnapRunnableImpl.java:541) at com.snaplogic.cc.snap.common.SnapRunnableImpl.doRun(SnapRunnableImpl.java:857) at com.snaplogic.cc.snap.common.SnapRunnableImpl.access$000(SnapRunnableImpl.java:117) at com.snaplogic.cc.snap.common.SnapRunnableImpl$1.run(SnapRunnableImpl.java:384) at com.snaplogic.cc.snap.common.SnapRunnableImpl$1.run(SnapRunnableImpl.java:380) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/javax.security.auth.Subject.doAs(Subject.java:423) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657) at com.snaplogic.cc.snap.common.SnapRunnableImpl.call(SnapRunnableImpl.java:379) at com.snaplogic.cc.snap.common.SnapRunnableImpl.call(SnapRunnableImpl.java:117) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: org.jruby.exceptions.NoMethodError: (NoMethodError) undefined methodhasNext’ for nil:NilClass
at RUBY.execute(:16)

================

Any help pls?

=====================
In order words, can you give me a JRuby example for Java 11 where an interface is implemented and also the object initialized properly? thnaks.

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs