A simple, naive standalone debugger for Scala. Goal is to connect to Apache Spark executors to examine the code as it is executed.
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When moving from Mac OS X's IntelliJ to the IntelliJ of Linux Mint, the tools.jar of OpenJDK/Oracle JDK was not picked up. I needed to manually open up the SDK being used and add the tools.jar of
/usr/lib/jvm/java-7-openjdk-amd64/lib/to the classpath. This allows me to use the Sun-basedcom.sun.jdipackage for a Java debugger interface rather than C++. -
When using the launching debugger, I noticed that it was creating an address of senkbeil.org:RANDOMPORT. senkbeil.org corresponded to my host name. Attempting to telnet into the address and port provided resulted in a failed connection. Switching my hostname to locahost allowed the main process (and telnet) to connect and use the JVM process.
- After observing IntelliJ's Scala plugin and the Scala IDE, it appears that stepping into a frame is not as simple as one would like in Scala. The process appears to use a series of hard-coded class and methods names to filter out when stepping into the next frame. This is performed using a series of step into and out of operations until the next valid location is reached.