jerrypeng opened a new pull request #3245: Fix: Empty exception message in java functions can cause an NPE URL: https://github.com/apache/pulsar/pull/3245 ### Motivation The following NPE could happen if Exception message is null ``` java.lang.NullPointerException: null at org.apache.pulsar.functions.proto.InstanceCommunication$FunctionStatus$ExceptionInformation$Builder.setExceptionString(InstanceCommunication.java:911) ~[org.apache.pulsar-pulsar-functions-proto-2.3.0-SNAPSHOT.jar:2.3.0-SNAPSHOT] at org.apache.pulsar.functions.instance.FunctionStatsManager.addSourceException(FunctionStatsManager.java:357) ~[org.apache.pulsar-pulsar-functions-instance-2.3.0-SNAPSHOT.jar:2.3.0-SNAPSHOT] at org.apache.pulsar.functions.instance.FunctionStatsManager.incrSourceExceptions(FunctionStatsManager.java:410) ~[org.apache.pulsar-pulsar-functions-instance-2.3.0-SNAPSHOT.jar:2.3.0-SNAPSHOT] at org.apache.pulsar.functions.instance.JavaInstanceRunnable.readInput(JavaInstanceRunnable.java:434) ~[org.apache.pulsar-pulsar-functions-instance-2.3.0-SNAPSHOT.jar:2.3.0-SNAPSHOT] at org.apache.pulsar.functions.instance.JavaInstanceRunnable.run(JavaInstanceRunnable.java:228) [org.apache.pulsar-pulsar-functions-instance-2.3.0-SNAPSHOT.jar:2.3.0-SNAPSHOT] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181] ``
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