warning: [deprecation] newInstance() in Class has been deprecated

[gayanW]

Several compiler warnings saying 'newInstance() in Class has been deprecated' appeared in build logs when compiled with JDK 9 and later,

[javac] /home/travis/build/javapathfinder/jpf-core/src/main/gov/nasa/jpf/vm/ClassInfo.java:402: warning: [deprecation] newInstance() in Class has been deprecated
[javac]             Object attr = attrCls.newInstance(); // needs to have a default ctor
[javac]                                  ^
[javac]   where T is a type-variable:
[javac]     T extends Object declared in class Class

[javac] /home/travis/build/javapathfinder/jpf-core/src/main/gov/nasa/jpf/listener/PathOutputMonitor.java:242: warning: [deprecation] newInstance() in Class has been deprecated
[javac]       return psClass.newInstance();
[javac]                     ^
[javac]   where T is a type-variable:
[javac]     T extends Object declared in class Class

Travis log:
https://travis-ci.org/javapathfinder/jpf-core/builds/384672396#L2431-L2444