When NetBeans is indexing your projects it needs a certain amount of (heap) memory to finish this task. In most situations the default settings should work out of the box.

If your project is very large, the indexing may fail to finish due to insufficient available memory. If the project is really large, increasing the heap size would probably help. Please check FaqSettingHeapSize for how to do that.

If the project is not of an exceptional size this condition is similar to the OutOfMemory condition and should be reported as an error for further investigation. Please consult FaqNetBeansAndOOME regarding how to file a bug against a memory problem.

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