The Java Debug Wire Protocol (JDT) is the standard protocol used for communicating between a Java virtual machine (jetty) and a profiler which it debug (hereafter referred to as the targeted JV). There are three aspects to Java Debug Wire Protocol that need to be understood before one can use it in a production environment. The first aspect is that of the target language that is executed by the computer being debugged. The next aspect is that of the program that is debugged. The last aspect of the JDT is that of the debugging tool or toolchain that is used during the debug session.
One of the major advantages of using the JDT over alternative protocols such as Tomcat or Solaris Logging Engine is that it provides a much richer list of features. Such features as verbose output, detailed debugging info, control via the command line, stack traces, detailed allocation and deallocation of heap objects, and detailed tracing of method calls and Java methods are provided by the JDT. The major disadvantage of the JDT is that it is typically used with more complex targets (such as in a full-featured app) than the more simple client-side frameworks like Sun’s Java. However, Java Enterprise Mobile offers a Java Mobile Development Kit (JJK) that offers the tools needed to debug on mobile devices. As such, with a properly installed and configured JDT, one can easily debug a wide variety of Java applications, including:
– Servlets: Servlets are low-level client-server apps that allow programmers to create lightweight web apps that run on the desktop. The Servlet specification defines the types of data that the server should send and receive. The Servlet allows for some very advanced features that include code injection, XMLrouting, and advanced content negotiation. Some Java Beans is used in Servlets, but they are separate objects and so are not part of the Java plugin. Instead, you need to load your own servlet-code library. For convenience, Servlets implement the Allocation and Metadata features of the Java plugin.
– Executable Scripts: A Java program normally consists of an executable code and an interpreter that runs the code at various phases during execution. To make your Java program to run correctly, you need to be able to write your code in a way that will be interpreted by the interpreter. To do this, use the Java debug wire protocol. This allows you to debug the various aspects of your code without actually getting into the inner workings of the program. If the Java program you are trying to debug prints any symbols, the debugging is enabled and you should be able to figure out what is wrong.
– The Java Debugger: Another Java program feature is the Java debug wire protocol. This allows the source code of your program to be debugged whenever the program is started up. This will allow you to examine the inner workings of your program, including the source code that generates the program as well as any other issues that might affect the execution. You should also be able to figure out whether the methods in the Java virtual machine are called from your code or from another part of the program. It is possible to trace Java program start methods and how they are called, as well as how they are stored when they are constructed.
– The Java Demo: A third important aspect of Java debugging is the Java demo. This allows you to run your program under a variety of different conditions, such as limiting code reuse, instrumentation, and other factors. The Java demo allows you to examine various cases and compare them with the one your program is trying to execute. It is also possible to trace various Java call sites and look at the behavior of the runtime. This is essential for debugging and understanding any security issues that can occur due to use of any of the Java’s primitive features. The jdwp exploitation feature can be used along with the jdns and/or and debugging to inspect Java classes and method declarations.
– The Java Attack: The last major component of debugging is the Java attack. This lets you find out the vulnerable software’s underlying structure and discover any security holes that it exposes. The most common way to carry out this operation is through the use of the Java exploit tool, which allows you to create exploits for the software. Most common ways of exploiting include by writing to a database that exposes a Java class or to an application that has used a Java feature without ensuring that it was enabled (i.e., un-checked). Other methods of vulnerability might include attacks on Java applets and Servlets, as well as attacks on the Java virtual machine itself. If you have an idea where the vulnerability is located, you can carry out a Java attack to find out the code path that enables it.