Java – Eclipse: Frustration with Java 1.7 (unbound library)

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I'm having trouble with a brand new project in a brand new installation of Eclipse. Repro steps:

  1. Download this version of Eclipse: http://www.eclipse.org/downloads/packages/eclipse-ide-java-developers/heliosr

  2. Unzip to c:\program files\eclipse java

  3. Launch Eclipse; choose a workspace

  4. File > New > Java Project

  5. Project name: Hello World. JRE: "Use an execution environment JRE: JavaSE-1.7"

  6. Hit Next, go to the Libraries tab. The only entry is JRE System Library [JavaSE-1.7] (unbound). What does "unbound" mean? How do I fix it?

  7. Hit Finish.

Expected: Brand new project works fine.

Actual: There are two errors:

The project cannot be built until build path errors are resolved HelloWord  Unknown Java Problem
Unbound classpath container: 'JRE System Library [JavaSE-1.7]' in project 'HelloWord' HelloWord  Build path Build Path Problem

What am I doing wrong here?

Update: Perhaps I don't actually have the Java 7 JDK on my machine. How can I be sure?

Update 2: Looks like Java 7 is in fact not out yet. Sweet.

Best Answer

1) Find out where java is installed on your drive, open a cmd prompt, go to that location and run ".\java -version" to find out the exact version. Or, quite simply, check the add/remove module in the control panel.

2) After you actually install jdk 7, you need to tell Eclipse about it. Window -> Preferences -> Java -> Installed JREs.

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