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    <p>Arkde, I have a possible explanation why Jaroslav's solution with JDK7 didn't work for you.</p> <p>Maybe you had mixed Java versions in various <strong>alternatives</strong> items, possibly conflicting with the version that environment variables like <code>JAVA_HOME</code> and <code>JDK_HOME</code> point to?</p> <p>Maybe something points to the <code>/usr/lib/jvm/default-java</code> symlink as the JDK home, and that symlink points to a different version of JDK than intended?</p> <p>Did you try resetting alternatives for all Java tools to version 7? Like this:</p> <pre><code>update-java-alternatives --list # ...see what JDK's are available, choose the one that corresponds to Java 7 # and set it to be the default in alternatives: sudo update-java-alternatives --set java-1.7.0-openjdk-amd64 # or interactively: sudo update-alternatives --config java </code></pre> <p>What do the following commands output on your system?</p> <pre><code>echo $JAVA_HOME echo $JDK_HOME ls -l /usr/lib/jvm/default-java update-java-alternatives --list update-alternatives --list java </code></pre> <p>I had exactly the same problem. I've performed strace on the Idea process and in the log I saw it trying to open several .class files without the path to them specified - like <code>open("SomeClass.class", O_RDONLY) = -1 ENOENT (No such file or directory)</code> - no path to the project output directory and to appropriate package. </p> <p>So I've apt-get installed JDK 7 along JDK 6:</p> <pre><code>apt-get install openjdk-7-doc openjdk-7-jdk openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib openjdk-7-source </code></pre> <p>In Ubuntu 11.10 Oneiric, OpenJDK 6 isn't removable if you want OpenJDK 7. JDK 7 is dependent on JDK 6...</p> <p>So I've:</p> <ol> <li>updated alternatives configuration as specified above,</li> <li>changed the <code>/usr/lib/jvm/default-java</code> symlink to point to <code>java-7-openjdk-amd64</code> ,</li> <li>double checked all the environment variables (my <code>JAVA_HOME</code> and <code>JDK_HOME</code> both point to <code>/usr/lib/jvm/default-java</code>),</li> <li>reconfigured my project's SDK appropriately (and for all the modules in the project),</li> </ol> <p>and voila - problem solved!</p>
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    1. USAleksander Adamowski
    1. USAleksander Adamowski
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    1. COThanks it worked :)
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      1. USAurelian Cotuna
 

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