possible basex 9.1.1 bug in java binding exception handling

On Thu, Dec 20, 2018 at 11:56 PM Mark McSweeny <mark.mcsweeny at aucerna.com> wrote: > 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$4(GUI.java:372) > at java.lang.Thread.run(Thread.java:745) > > > The stack trace suggests that the error is occurring while the system is > assembling the error message. It generates a string describing the Java > arguments: > > > https://github.com/BaseXdb/basex/blob/9.1.1/basex-core/src/main/java/org/basex/query/func/java/JavaEval.java#L188 > > ... but when it tries to determine the type of "null": > > > https://github.com/BaseXdb/basex/blob/9.1.1/basex-core/src/main/java/org/basex/query/func/java/JavaEval.java#L203 > > ... it incurs a NullPointerException while calling "null.getClass()": > > > https://github.com/BaseXdb/basex/blob/9.1.1/basex-core/src/main/java/org/basex/util/Util.java#L70 > > > I hope this report is helpful. > > Take care, > > Mark > > Mark McSweeny > Development Team Lead > t: *403-648-4602 + 4602* <403-648-4602%20+%204602> > e: *mark.mcsweeny at aucerna.com* <mark.mcsweeny at aucerna.com> > Learn more about Aucerna > *www.3esi-enersight.com/blog/palantir-solutions* > <https://3esi-enersight.com/blog/palantir-solutions/> > [image: Facebook] <https://www.facebook.com/3esiEnersight/> > [image: LinkedIn] <https://www.linkedin.com/company/3esi> > [image: Twitter] <https://www.twitter.com/3esi_Enersight> > Confidentiality Notice: > The information transmitted herein may contain confidential, proprietary > and/or privileged material which belongs to Aucerna and is only for the > intended addressee(s). Any unauthorized review, distribution or other use > of this information is prohibited. Finally, the recipient should check this > email and any attachments for the presence of viruses. The organization > accepts no liability for any damage caused by any virus transmitted by this > email. If you received this email in error, please contact us at (403) > 270-3270 or by return email and delete this email and any copies > immediately. v&7.11.1989&$ >