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Once the JVM is started, we are going to use the remote support from Eclipse Java Debugger to connect to the JVM and start a debug session.

The basic idea is that we are going to start the JVM running your Java topology in debug mode. Debugging in Standalone or Distributed Modeĭebugging a Streams Java application in standalone and distributed mode is similar to debugging a Java primitive operator. We still need a way to debug the Streams Java application when running in standalone or distributed mode. Launching of the debugger in EMBEDDED mode does not help debug these issues. For example, your application may have issues in specifying classpath dependencies or packaging of the application bundle. In some cases, problems may only arise when the application is run in STANDALONE or DISTRIBUTED mode. It then builds the application bundle and then execute the bundle. When the application is launched in STANDALONE or DISTRIBUTED mode, the topology toolkit generates the SPL code for the application.If you application uses dynamic connections, you will have to comment out this code for the application to launch. Since the application is running in EMBEDDED mode, dynamic connection (publish/subscribe) is not supported.This is the easiest way to develop and debug your Streams application in Java. This will launch a debug session in Eclipse. In the Java Editor, right click -> Debug As Java Application.Set a breakpoint to the location where you would like the debugger to stop.Therefore, you can use the Eclipse Java Debugger like you normally would to debug this application: In this Streams context, the execution of the Topology is done in the same JVM used to launch it. When the application is submitted in EMBEDDED mode, the application is going to run in a simulated Java environment. In this example, the application is submitted in EMBEDDED mode. The topology is then submitted to a Streams context to be executed. The numbers are then printed out to the console. This application has an endless source that continuously generates a list of random temperature readings.