FULL PRODUCT VERSION :
openjdk version "11.0.6" 2020-01-14
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.6+10)
Eclipse OpenJ9 VM AdoptOpenJDK (build openj9-0.18.1, JRE 11 Windows Server 2012 R2 amd64-64-Bit Compressed References 20200122_442 (JIT enabled, AOT enabled)
OpenJ9 - 51a5857d2
OMR - 7a1b0239a
JCL - da35e0c380 based on jdk-11.0.6+10)

ADDITIONAL OS VERSION INFORMATION :
Windows Server 2012R2

A DESCRIPTION OF THE PROBLEM :
Eclipse OpenJ9 VM detected some JNI errors about ReleaseStringChars in Windows Print.
(Hotspot VM has different checks and other warnings were detected.)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Launch SwingSet2 demo with jni checking and OpenJ9
2. Move to TableDemo
3. Click "Print" button
Then, the following errors were detected.

$ java -Xcheck:jni:nonfatal -jar SwingSet2.jar
JVMJNCK001I JNI check utility installed. Use -Xcheck:jni:help for usage
JVMJNCK056E JNI error in ReleaseStringChars: Got memory 0x000000A290E3F3E8 from object 0x00000000002F47E0, releasing from 0x00000000002F47E8
JVMJNCK077E Error detected in sun/print/Win32PrintService.getCapabilities(Ljava/lang/String;Ljava/lang/String;)I

JVMJNCK023E JNI error detected. Continuing...
JVMJNCK056E JNI error in ReleaseStringChars: Got memory 0x000000A290E403A8 from object 0x00000000002F47B8, releasing from 0x00000000002F47C0
JVMJNCK077E Error detected in sun/print/Win32PrintService.getAllResolutions(Ljava/lang/String;Ljava/lang/String;)[I

JVMJNCK023E JNI error detected. Continuing...

EXPECTED VERSUS ACTUAL BEHAVIOR :
Expected: No errro
Actual: JNI errors were detected

REPRODUCIBILITY :
This bug can be reproduced always.