Intellij idea debug12/10/2023 For example, it is not possible to view line numbers or stop at breakpoints without line number information. If the bytecode of the debuggee does not include debugging information, the debugger will still be able to attach, however, some of the debugger functionality may be unavailable. By default, the compiler includes most of the information required for debugging, but if it was not you, who compiled the application, it may happen that the program that you are going to debug was compiled without this information. This is controlled with the -g compiler flag. The debugging information is provided to the program at compile-time. The bytecode of an application may or may not have debugging information included. The debugger uses this information to identify local variables, line numbers, and so on. Debugging informationĭebugging information is special kind of information in the application bytecode. Using the read-only mode, you can figure out what method caused the program to hang, and which file it is processing at the moment. An example of the situation when it can be useful is when your program hung while batch-processing a lot of files. This isn't debugging in the traditional sense and should be viewed as an extended thread dump. The debugger functionality will be limited to viewing the call stack and examining the related local variables. If a local process doesn't use the debug agent, you can still attach to it in the read-only mode. For example, the other process may use a configuration file for passing the option to the debuggee. If the process is launched through another process, for example, a web container like Apache Tomcat, the debug agent VM option may need to be specified indirectly. To get an appropriately formatted string for your JDK, you can select the required JDK version in the Remote JVM debug run/debug configuration and copy it from there. The format may differ depending on the JDK version. Onuncaught – optionally delays the connection until an uncaught exception is thrown. Onthrow – optionally delays the connection until the specified exception is thrown. Suspend=y – specifies that the process should wait until the debugger has been connected before proceeding. Server=n – specifies that the process should connect to the debugger (act as a client) agentlib:jdwp=transport=dt_socket,server=n,address=192.168.1.178:5005,suspend=y,onthrow=,onuncaught=Īddress – the IP address and the port of the server end. When starting the process, add the following line to its VM options: The debuggee communicates with IntelliJ IDEA debugger over a socket connection, irrespective of whether the process is local or remote. Debug agent is an entity responsible for communicating with the debugger. ![]() Processes intended to allow debugger connections are started with the debug agent. These requirements are described in more detail in subsequent chapters. ![]() You need to have sources of the application.ĭebugging is still possible even when none of these are met, however, there are limitations associated with each of them. The application needs to be compiled with debugging information. The remote process should be started with the debug agent. While not absolutely required, the following prerequisites have to be met to enable full-fledged debugging: Options described in this topic are useful in more complicated cases, such as when we need to debug a process that is running remotely, or a process that has been started in a way that does not allow for debugging. You don't want to attach to a 'hello world' running on the same machine. While IntelliJ IDEA debugger is capable of attaching to any process, it is recommended to prefer a simpler way when there is one. This way gives you the full debugger functionality while sparing you the overhead of extra configuration. The steps to attach to a process depend on how and where the process was launched.įirst off, if you want to debug a program that can be started from IntelliJ IDEA, the best way to do so is to start a local debugging session. IntelliJ IDEA provides a way to attach the debugger to both local and remote processes.
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