Java.Io.Console Support in Eclipse Ide

java.io.Console support in Eclipse IDE

I assume you want to be able to use step-through debugging from Eclipse. You can just run the classes externally by setting the built classes in the bin directories on the JRE classpath.

java -cp workspace\p1\bin;workspace\p2\bin foo.Main

You can debug using the remote debugger and taking advantage of the class files built in your project.

In this example, the Eclipse project structure looks like this:

workspace\project\
                 \.classpath
                 \.project
                 \debug.bat
                 \bin\Main.class
                 \src\Main.java

1. Start the JVM Console in Debug Mode

debug.bat is a Windows batch file that should be run externally from a cmd.exe console.

@ECHO OFF
SET A_PORT=8787
SET A_DBG=-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=%A_PORT%,server=y,suspend=y
java.exe %A_DBG% -cp .\bin Main

In the arguments, the debug port has been set to 8787. The suspend=y argument tells the JVM to wait until the debugger attaches.

2. Create a Debug Launch Configuration

In Eclipse, open the Debug dialog (Run > Open Debug Dialog...) and create a new Remote Java Application configuration with the following settings:

• Project: your project name
• Connection Type: Standard (Socket Attach)
• Host: localhost
• Port: 8787

3. Debugging

So, all you have to do any time you want to debug the app is:

• set a break point
• launch the batch file in a console
• launch the debug configuration

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You can track this issue in bug 122429. You can work round this issue in your application by using an abstraction layer as described here.

Eclipse Switch focus to console on Run

You can change to a view with the keyboard shortcut Alt+Shift+Q, release keys, and then wait for a moment and you will get a pop-up of views to select:

If you then press C the console will open. You don't have to wait for the pop-up if you don't want to.

If you want to change to the console often, perhaps a shorter key sequence.

In Preferences choose General -> Keys, then scroll or use filter to find Show View (Console) and you can change the shortcut:

Output to Eclipse console from jar running externally

1. Run it from the command line.
2. run it from another Java program as a separate JVM process, and capture the InputStream, OutputStream, and ErrorStreams for input and output.

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