NullPointerException at java.util.logging.Logger.demandLogger

stefan.m Published at Dev

stefan.m

After upgrading from Java 6 to Java 8, my application throws the following exception:

com.mathworks.toolbox.javabuilder.MWException: Java exception occurred: 
java.lang.NullPointerException
    at java.util.logging.Logger.demandLogger(Logger.java:451)
    at java.util.logging.Logger.getLogger(Logger.java:502)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.mclFeval(Native Method)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.access$600(MWMCR.java:23)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR$6.mclFeval(MWMCR.java:833)
    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:483)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR$5.invoke(MWMCR.java:731)
    at com.sun.proxy.$Proxy2.mclFeval(Unknown Source)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.invoke(MWMCR.java:406)
    at mDataEngine.mDataEngineMIF.volatility(mDataEngineMIF.java:7212)

This occurs when using the mathworks library, which in turn uses java.util.logging.Logger where the exception is thrown.

jmehrens

The Oracle bug JDK-8145302 NullPointerException at java.util.logging.Logger.demandLogger has been replaced with

JDK-8177325 Caller sensitive methods Logger.getLogger, Logger.getAnonymousLogger, will throw NPE if there is no caller on the stack.

The workaround in that bug report is listed as:

Workaround: use an auxiliary class in order to call Logger.getLogger instead of calling Logger::getLogger directly from JNI.

As you can see from your stacktrace:

java.lang.NullPointerException
at java.util.logging.Logger.demandLogger(Logger.java:451)
at java.util.logging.Logger.getLogger(Logger.java:502)
at com.mathworks.toolbox.javabuilder.internal.MWMCR.mclFeval(Native Method) 
...

the com.mathworks.toolbox.javabuilder.internal.MWMCR.mclFeval is a JNI method calling java.util.logging.Logger.getLogger.

Mathworks should update the MWMCR class to include a java helper method to invoke getLogger and that helper method should be called from JNI instead of getLogger directly.

Collected from the Internet

Please contact [email protected] to delete if infringement.