"Bad global or local ref passed to JNI" in java.io.InputStreamReader.read()

###@###.### 2003-05-22

SAP has found the following problem when starting their IPC application
on Windows 2000 with 1.3.1_08 and -Xcheck:jni:

> FATAL ERROR in native method: Bad global or local ref passed to JNI
        at java.io.InputStreamReader.read(InputStreamReader.java:245)
        at java.io.BufferedReader.read1(BufferedReader.java:180)
        at java.io.BufferedReader.read(BufferedReader.java:256)
        - locked <2f278f8> (a java.io.InputStreamReader)
        at com.sap.sxe.socket.server.SocketConnection.work(SocketConnection.java:137)
        at com.sap.sxe.socket.server.Worker.run(Worker.java:107)

The source for the SocketConenction.java class is attached, and there is no SAP JNI
calls anywhere in this. I'm confusded by the fact that a call in the Java IO
libs can produce such a problem, but I haven't found anything in the Java
bug database or on the web.