The information provided includes:
class name: java.lang.Runtime
method name: exec()
source code filename: Runtime.java
source code line number: 551
When you run a java program, there are a few parts to be aware of:
java.exe (a binary program which runs the java interpreter; the interpreter loads java files which have been compiled into classes)
system classes (these classes come with the java system; most of them start with java.lang)
application or applet classes (these are written by the application developer)
If you are using a JDK from Sun, the source files for system classes can be found in a file called src.zip. If the class is named java.lang.Runtime, you should look for a file named java/lang/Runtime.java.