ResourceBundle improper caching causes tools/javadoc tests intermittently

tools/javadoc/CheckResourceKeys.java
tools/javadoc/MethodLinks.java
tools/javadoc/ReleaseOption.java
tools/javadoc/XWerror.java

The above tests faile due to they cannot find the requested resource bundle, like the below,
----------System.err:(56/4254)----------
java.lang.InternalError: Cannot find requested resource bundle for locale en_US
at jdk.compiler/com.sun.tools.javac.util.JavacMessages.getBundles(JavacMessages.java:128)
at jdk.compiler/com.sun.tools.javac.util.JavacMessages.getLocalizedString(JavacMessages.java:147)
at jdk.javadoc/com.sun.tools.javadoc.main.Messager.getText(Messager.java:149)
at jdk.javadoc/com.sun.tools.javadoc.main.Messager.notice(Messager.java:272)
at jdk.javadoc/com.sun.tools.javadoc.main.DocEnv.notice(DocEnv.java:524)
at jdk.javadoc/com.sun.tools.javadoc.main.JavadocTool.parse(JavadocTool.java:246)
at jdk.javadoc/com.sun.tools.javadoc.main.JavadocTool.getRootDocImpl(JavadocTool.java:173)
at jdk.javadoc/com.sun.tools.javadoc.main.Start.parseAndExecute(Start.java:433)
at jdk.javadoc/com.sun.tools.javadoc.main.Start.begin(Start.java:238)
at jdk.javadoc/com.sun.tools.javadoc.main.Start.begin(Start.java:224)
at jdk.javadoc/com.sun.tools.javadoc.Main.execute(Main.java:151)
at MethodLinks.main(MethodLinks.java:40)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:538)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:230)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.util.MissingResourceException: Can't find bundle for base name com.sun.tools.javadoc.resources.javadoc, locale en_US
at java.base/java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:2085)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1732)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1622)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1597)
at java.base/java.util.ResourceBundle.getBundle(ResourceBundle.java:1006)
at jdk.javadoc/com.sun.tools.javadoc.main.Messager.lambda$new$0(Messager.java:131)
at jdk.compiler/com.sun.tools.javac.util.JavacMessages.getBundles(JavacMessages.java:125)
... 17 more
java.lang.InternalError: Cannot find requested resource bundle for locale en_US
at jdk.compiler/com.sun.tools.javac.util.JavacMessages.getBundles(JavacMessages.java:128)
at jdk.compiler/com.sun.tools.javac.util.JavacMessages.getLocalizedString(JavacMessages.java:147)
at jdk.javadoc/com.sun.tools.javadoc.main.Messager.getText(Messager.java:149)
at jdk.javadoc/com.sun.tools.javadoc.main.Messager.error(Messager.java:254)
at jdk.javadoc/com.sun.tools.javadoc.main.Start.begin(Start.java:249)
at jdk.javadoc/com.sun.tools.javadoc.main.Start.begin(Start.java:224)
at jdk.javadoc/com.sun.tools.javadoc.Main.execute(Main.java:151)
at MethodLinks.main(MethodLinks.java:40)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:538)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:230)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.util.MissingResourceException: Can't find bundle for base name com.sun.tools.javadoc.resources.javadoc, locale en_US
at java.base/java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:2085)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1732)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1622)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1597)
at java.base/java.util.ResourceBundle.getBundle(ResourceBundle.java:1006)
at jdk.javadoc/com.sun.tools.javadoc.main.Messager.lambda$new$0(Messager.java:131)
at jdk.compiler/com.sun.tools.javac.util.JavacMessages.getBundles(JavacMessages.java:125)
... 13 more

JavaTest Message: Test threw exception: java.lang.InternalError
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.InternalError: Cannot find requested resource bundle for locale en_US


test result: Failed. Execution failed: `main' threw exception: java.lang.InternalError: Cannot find requested resource bundle for locale en_US