What are common causes for IntelliJ IDEA not being able to resolve built-in JVM types and methods? For example, when I mouse over String
the tooltip says "Cannot resolve symbol 'String'". It's as if IntelliJ has doesn't know where the JVM is.
By the way, I am running OS X 10.6.6. Everything was working fine until I ran the system update this morning.
“cannot resolve symbol” means that the Java compiler cannot locate a symbol referenced in your Java source code. The causes for this common error include: A missing class file. A faulty CLASSPATH.
Check that you have a proper JVM SDK setting in IntelliJ Properties. If invalidate-cache-and-restart isn't enough, check that your are using the proper JVM SDK, such as Java 1.7. If you've made a change, then it's probably best to re-run Invalidate Cache & Restart. Show activity on this post.
Most likely JDK configuration is not valid, try to remove and add the JDK again as I've described in the related question here.
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