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Recently updated to android 2.2 .

tried opening an existing project. It prompted me to convert, I accepted. The project imported successfully but whenever I tried building, I get: 

Error:Execution failed for task ':app:mergeDebugResources'. > java.lang.OutOfMemoryError: unable to create new native thread

I have added :

org.gradle.daemon=false
GRADLE_OPTS="-Xmx2048m -Xms2048m -XX:MaxPermSize=1024m"
org.gradle.jvmargs=-XX:MaxPermSize=512m

to gradle.properties. Still, it hasn't worked.

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You have a chance to face the java.lang.OutOfMemoryError: Unable to create new native thread whenever the JVM asks for a new thread from the OS. Whenever the underlying OS cannot allocate a new native thread, this OutOfMemoryError will be thrown. The exact limit for native threads is very platform-dependent thus we recommend to find out those limits by running a test similar to the below example. But, in general, the situation causing java.lang.OutOfMemoryError: Unable to create new native thread goes through the following phases:

  1. A new Java thread is requested by an application running inside the JVM
  2. JVM native code proxies the request to create a new native thread to the OS The OS tries to create a new native thread which requires memory to be allocated to the thread
  3. The OS will refuse native memory allocation either because the 32-bit Java process size has depleted its memory address space – e.g. (2-4) GB process size limit has been hit – or the virtual memory of the OS has been fully depleted
  4. The java.lang.OutOfMemoryError: Unable to create new native thread error is thrown.

Reference: https://plumbr.eu/outofmemoryerror/unable-to-create-new-native-thread

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Switched back to gradle 2.1.3 from 2.2.0 fixed the problem.

From this thread.

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