ImplicitStringConcatManyLongs.java fails with:

java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at java.lang.String.getBytes(String.java:3000)
at java.lang.StringConcatHelper.prepend(StringConcatHelper.java:330)
at ImplicitStringConcatManyLongs.main(ImplicitStringConcatManyLongs.java:147)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:520)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:92)
at java.lang.Thread.run(Thread.java:804)

Could be related to JDK-8148760.