Troubleshooting Tools for Java™

cp = classpath("C:/Java/1.4.2", "lib/*.jar")  
        .add("jre/lib/ext/*.jar")  
        .remove("jre/lib/ext/ldapsec.jar");  
cp.toString(); 

fields(String.class).serialVersionUID = 0;
s = "test";
fields(s).count = 2;
print(s);
fields(s);

/**
 * The method descriptor has the following properties
 * - String method.name
 * - Object[] method.args
 * - Object method.object (this or class for static)
 * - Class method.objectClass (class)
 * - Object method.value
 * - String method.trace
 * - StackTraceElement[] method.stacktrace
 * - Method method.instance
 * - Throwable method.exception (pending exception)
 * - boolean method.ignore (do not execute the method body 
 * if true)
 *
 * Assigning a value to method.args[i] will replace
 * the i-th argument of the method.
 * The return value of the method can be modified too.
 * The exception can be re-thrown or ignored
 */
class Advice {
  /**
   * Invoked before the method is executed.
   */
  enter(method) 
  {}

  /**
   * Invoked for methods returning int values.
   * n the return value of the intercepted method.
   * The value returned by this method replaces
   * the value of the intercepted method.
   */
  int value(method, int n) 
  { return n; }

  /**
   * Invoked for methods returning long values.
   * n the return value of the intercepted method.
   * The value returned by this method replaces
   * the value of the intercepted method.
   */
  long value(method, long n) 
  { return n; }

  ...	
	
  /**
   * Invoked for methods returning non-primitive values.
   * n the return value of the intercepted method.
   * The value returned by this method replaces
   * the value of the intercepted method.
   */
  Object value(method, Object n)
  { return n; }

  /**
   * Invoked only when the intercepted method 
   * throws an exception.
   * Set method.exception to null if you want
   * to ignore the exception.
   */
  void exception(method)
  { method.exception = null; }

  /**
   * Invoked always at the end of the intercepted method.
   * Even in case of an exception.
   */
  void exit(method) 
  {}
}

class Advice {
  enter(m) { 
    m.args[0] = m.args[0].toUpperCase(); 
  }
}

intercept("javax.swing.text.JTextComponent", 
    "setText\\(Ljava/lang/String;\\)V", 
    new Advice());

pipe("threads()").to("!grep system").to("!head -2");

Starts a command line interactive session with a SQL server (jisql) inside the target process. It can work with an existing connection or a new one can be created with the following parameters:
-driver specifies the JDBC driver to use. There are several builtin shortcuts - see the docs for details.
-cstring specifies the connection string to use. These are driver specific.
-user specifies a user name to log into a database server with.
-password specifies the user name to log into a database server with.
-c specifies the command terminator. The default is "go".
-w specifies the maximum field width for a column. The default is to output the full width of the column.
-input specifies a file name to read commands from.
-debug prints to stdout (System.out) debugging information.

For more details see:
http://www.xigole.com/software/jisql.jsp