Hello,
I am seeing a possible bug during exception-handling while using Java binding in BaseX version 9.1.1. The problem can be illustrated by the following minimal working example query:
Q{java.lang.String}new*java.lang.String(())
This is equivalent to the Java expression "new String(null)". "null" is not valid for this constructor so an exception is thrown.
In version 9.1, I see the expected error:
[XPTY0004] String.new(empty-sequence()): java.lang.NullPointerException.
In version 9.1.1, I get message suggesting a potential bug along with a full stack trace:
Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk@... Version: BaseX 9.1.1 Java: Oracle Corporation, 1.8.0_92 OS: Windows 10, amd64 Stack Trace: java.lang.NullPointerException at org.basex.util.Util.className(Util.java:70) at org.basex.query.func.java.JavaEval.type(JavaEval.java:203) at org.basex.query.func.java.JavaEval.types(JavaEval.java:188) at org.basex.query.func.java.JavaEval.execError(JavaEval.java:149) at org.basex.query.func.java.DynJavaConstr.eval(DynJavaConstr.java:78) at org.basex.query.func.java.JavaCall.value(JavaCall.java:70) at org.basex.query.func.java.JavaCall.iter(JavaCall.java:63) at org.basex.query.scope.MainModule.iter(MainModule.java:118) at org.basex.query.QueryContext.iter(QueryContext.java:335) at org.basex.query.QueryContext.cache(QueryContext.java:613) at org.basex.query.QueryProcessor.cache(QueryProcessor.java:112) at org.basex.core.cmd.AQuery.query(AQuery.java:103) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:257) at org.basex.core.Command.execute(Command.java:93) at org.basex.gui.GUI.exec(GUI.java:429) at org.basex.gui.GUI.lambda$4(GUI.java:372) at java.lang.Thread.run(Thread.java:745)
The stack trace suggests that the error is occurring while the system is assembling the error message. It generates a string describing the Java arguments:
https://github.com/BaseXdb/basex/blob/9.1.1/basex-core/src/main/java/org/bas...
... but when it tries to determine the type of "null":
https://github.com/BaseXdb/basex/blob/9.1.1/basex-core/src/main/java/org/bas...
... it incurs a NullPointerException while calling "null.getClass()":
https://github.com/BaseXdb/basex/blob/9.1.1/basex-core/src/main/java/org/bas...
I hope this report is helpful.
Take care,
Mark
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