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Unable to install Java 7 in Eclipse on Mac OS


I installed Java 7 on my Mac, and tried to update Java 7 in my Eclipse application build path. After adding the jdk configuration, Eclipse was throwing below error:

Build path entry is missing: org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7

To address this problem, open your terminal and run below commands. After running these commands, restart your Eclipse and set Java 7 in your application build path.

cd /Library/Java/JavaVirtualMachines
sudo ln -s `pwd`/JDK\ 1.7.0\ Developer\ Preview.jdk/Contents/Home jdk-1.7.0

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Knowledge Centre
wait Vs sleep methods
sleep(): It is a static method on Thread class. It makes the current thread into the "Not Runnable" state for specified amount of time. During this time, the thread keeps the lock (monitors) it has acquired.

wait(): It is a method on Object class. It makes the current thread into the "Not Runnable" state. Wait is called on a object, not a thread. Before calling wait() method, the object should be synchronized, means the object should be inside synchronized block. The call to wait() releases the acquired lock.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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