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49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
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# Debugging Enso and Java Code at Once
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Enso libraries are written in a mixture of Enso code and Java libraries.
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Debugging both sides (the Java as well as Enso code) is possible with a decent
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IDE.
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Get [NetBeans](http://netbeans.apache.org) version 13 or newer or
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[VS Code with Apache Language Server extension](https://cwiki.apache.org/confluence/display/NETBEANS/Apache+NetBeans+Extension+for+Visual+Studio+Code)
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and _start listening on port 5005_ with _Debug/Attach Debugger_ or by specifying
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following debug configuration in VSCode:
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```json
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{
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"name": "Listen to 5005",
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"type": "java+",
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"request": "attach",
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"listen": "true",
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"hostName": "localhost",
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"port": "5005"
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}
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```
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Then it is just about executing following Sbt command which builds CLI version
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of the engine, launches it in debug mode and passes all other arguments to the
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started process:
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```bash
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sbt:enso> runEngineDistribution --debug --run ./test/Tests/src/Data/Numbers_Spec.enso
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```
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Alternatively you can pass in special JVM arguments when launching the
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`bin/enso` launcher:
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```bash
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enso$ JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,server=n,address=5005 ./built-distribution/enso-engine-*/enso-*/bin/enso --run ./test/Tests/src/Data/Numbers_Spec.enso
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```
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As soon as the debuggee connects and the Enso language starts - choose the
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_Toggle Pause in GraalVM Script_ button in the toolbar:
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and your execution shall stop on the next `.enso` line of code. This mode allows
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to debug both - the Enso code as well as Java code. The stack traces shows a
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mixture of Java and Enso stack frames by default. Right-clicking on the thread
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allows one to switch to plain Java view (with a way more stack frames) and back.
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Analyzing low level details as well as Enso developer point of view shall be
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simple with such tool.
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