Java executable not found in JDK, evaluating java executable in RT instead

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  1.      Warning: java executable not found in JDK, evaluating java executable in RT instead.
  2.      Warning: java executable not found in JDK, evaluating java executable in RT instead.
  3.      Warning: java executable not found in JDK, evaluating java executable in RT instead.
  4.      error: modules are not supported in -source 1.8 java

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