Java debugging techniques - nimrody/knowledgebase GitHub Wiki

Use jstack to dump all threads call-stack. Set thread name to show what the thread is currently doing ("processing XYZZ; entering UVW..."):

Thread.currentThread().setName(Context + TID + Params + current Time,..);

Compiled type signature

It's always a set of parentheses enclosing type signifiers for the arguments, one after the other with no commas or anything, followed by a type signifier for the return value after the closing paren. It's pretty straightforward.

There's a table of type signatures on this page:

Signature	 Java Type
Z	 boolean
B	 byte
C	 char
S	 short
I	 int
J	 long
F	 float
D	 double
V	 void
L fully-qualified-class ;	 fully-qualified-class
[ type  type[]

Those last two mean that to name a class, you say, for example, Ljava/lang/Object;, and to name an array of (for example) int, you say [I, and an array of array of int is [[I.

If you wanted to literally compute the signature in Java code based on reflection, it'd be simple enough; just use the table above with rules for handling objects and arrays.