Hi Andy, Christian,
 
a default constructor is added implicitly, when a class does not provide any constructors itself. A REx-generated class however comes with a constructor. In that case any instantiation must provide arguments for some defined constructor.
 
However I do not see a real reason for instantiating the class at load time. The generated parse function is static and it takes care of instantiating a parser object internally.
 
I just did a quick test and found that I see this instantiating problem when using "import module namespace ...". No problem when using "declare namespace ...." or just an EQName literal instead. I have put my extension function class files into the classpath for checking this.
 
Am I missing something here?
 
Best regards
Gunther
 
Gesendet: Donnerstag, 07. April 2016 um 19:34 Uhr
Von: "Christian Grün" <christian.gruen@gmail.com>
An: "Andy Bunce" <bunce.andy@gmail.com>
Cc: "Gunther Rademacher" <grd@gmx.net>, "basex-talk@mailman.uni-konstanz.de" <basex-talk@mailman.uni-konstanz.de>
Betreff: Re: [basex-talk] Problem deleting jar packaged item from repo
> I can't see why Java's Default Constructor [1] rule does not apply here?

Well, me neither ;) Maybe it’s got to do with the way we instantiate
the class via reflection? I didn’t track this down yet (I should
probably do so).


> /Andy
> http://docs.oracle.com/javase/specs/jls/se7/html/jls-8.html#jls-8.8.9
>
> On 7 April 2016 at 17:58, Christian Grün <christian.gruen@gmail.com> wrote:
>>
>> > No constructor is the issue. Adding
>> > public CR_xquery_31_20151217() {}
>> > to java src fixes it.
>>
>> Thanks! @Gunther: Do you think such a dummy constructor could be added
>> to the Java class?
>>
>>
>>
>> > On 7 April 2016 at 16:05, Andy Bunce <bunce.andy@gmail.com> wrote:
>> >>
>> >> C:\Program Files (x86)\BaseX\bin
>> >> +>basex -d
>> >> BaseX 8.4.3 beta d7bbbe7 [Standalone]
>> >> Try 'help' to get more information.
>> >> > xquery import module namespace
>> >> > p="org.basex.modules.CR_xquery_31_20151217";2
>> >> Creating Database...
>> >> . 27.04 ms (25844 KB)
>> >> Creating Database...
>> >> . 4.83 ms (25844 KB)
>> >> Creating Database...
>> >> . 5.0 ms (25844 KB)
>> >> Creating Database...
>> >> . 3.52 ms (26509 KB)
>> >> Creating Database...
>> >> . 4.36 ms (26509 KB)
>> >> Creating Database...
>> >> . 8.26 ms (26509 KB)
>> >> Creating Database...
>> >> . 8.37 ms (26509 KB)
>> >> Creating Database...
>> >> . 4.32 ms (27175 KB)
>> >> Creating Database...
>> >> . 11.38 ms (27175 KB)
>> >> java.lang.InstantiationException:
>> >> org.basex.modules.CR_xquery_31_20151217
>> >> at java.lang.Class.newInstance(Unknown Source)
>> >> at
>> >> org.basex.query.util.pkg.ModuleLoader.addImport(ModuleLoader.java:124)
>> >> at
>> >> org.basex.query.QueryParser.importModule(QueryParser.java:772)
>> >> at
>> >> org.basex.query.QueryParser.importModules(QueryParser.java:758)
>> >> at org.basex.query.QueryParser.parseMain(QueryParser.java:172)
>> >> at
>> >> org.basex.query.QueryContext.parseMain(QueryContext.java:223)
>> >> at org.basex.query.QueryProcessor.parse(QueryProcessor.java:57)
>> >> at org.basex.core.cmd.AQuery.parse(AQuery.java:145)
>> >> at org.basex.core.cmd.AQuery.updates(AQuery.java:159)
>> >> at org.basex.core.cmd.AQuery.updating(AQuery.java:267)
>> >> at org.basex.core.Command.execute(Command.java:94)
>> >> at
>> >> org.basex.api.client.LocalSession.execute(LocalSession.java:132)
>> >> at org.basex.api.client.Session.execute(Session.java:36)
>> >> at org.basex.core.CLI.execute(CLI.java:103)
>> >> at org.basex.core.CLI.execute(CLI.java:87)
>> >> at org.basex.BaseX.console(BaseX.java:191)
>> >> at org.basex.BaseX.<init>(BaseX.java:166)
>> >> at org.basex.BaseX.main(BaseX.java:42)
>> >> Caused by: java.lang.NoSuchMethodException:
>> >> org.basex.modules.CR_xquery_31_20151217.<init>()
>> >> at java.lang.Class.getConstructor0(Unknown Source)
>> >> ... 18 more
>> >> org.basex.query.QueryException: Could not instantiate
>> >> org.basex.modules.CR_xquery_31_20151217:
>> >> org.basex.modules.CR_xquery_31_20151217.
>> >> at org.basex.query.QueryError.get(QueryError.java:1343)
>> >> at
>> >> org.basex.query.util.pkg.ModuleLoader.addImport(ModuleLoader.java:127)
>> >> at
>> >> org.basex.query.QueryParser.importModule(QueryParser.java:772)
>> >> at
>> >> org.basex.query.QueryParser.importModules(QueryParser.java:758)
>> >> at org.basex.query.QueryParser.parseMain(QueryParser.java:172)
>> >> at
>> >> org.basex.query.QueryContext.parseMain(QueryContext.java:223)
>> >> at org.basex.query.QueryProcessor.parse(QueryProcessor.java:57)
>> >> at org.basex.core.cmd.AQuery.parse(AQuery.java:145)
>> >> at org.basex.core.cmd.AQuery.updates(AQuery.java:159)
>> >> at org.basex.core.cmd.AQuery.updating(AQuery.java:267)
>> >> at org.basex.core.Command.execute(Command.java:94)
>> >> at
>> >> org.basex.api.client.LocalSession.execute(LocalSession.java:132)
>> >> at org.basex.api.client.Session.execute(Session.java:36)
>> >> at org.basex.core.CLI.execute(CLI.java:103)
>> >> at org.basex.core.CLI.execute(CLI.java:87)
>> >> at org.basex.BaseX.console(BaseX.java:191)
>> >> at org.basex.BaseX.<init>(BaseX.java:166)
>> >> at org.basex.BaseX.main(BaseX.java:42)
>> >> Caused by: java.lang.InstantiationException:
>> >> org.basex.modules.CR_xquery_31_20151217
>> >> at java.lang.Class.newInstance(Unknown Source)
>> >> at
>> >> org.basex.query.util.pkg.ModuleLoader.addImport(ModuleLoader.java:124)
>> >> ... 16 more
>> >> Caused by: java.lang.NoSuchMethodException:
>> >> org.basex.modules.CR_xquery_31_20151217.<init>()
>> >> at java.lang.Class.getConstructor0(Unknown Source)
>> >> ... 18 more
>> >> org.basex.query.QueryException: Could not instantiate
>> >> org.basex.modules.CR_xquery_31_20151217:
>> >> org.basex.modules.CR_xquery_31_20151217.
>> >> at org.basex.query.QueryError.get(QueryError.java:1343)
>> >> at
>> >> org.basex.query.util.pkg.ModuleLoader.addImport(ModuleLoader.java:127)
>> >> at
>> >> org.basex.query.QueryParser.importModule(QueryParser.java:772)
>> >> at
>> >> org.basex.query.QueryParser.importModules(QueryParser.java:758)
>> >> at org.basex.query.QueryParser.parseMain(QueryParser.java:172)
>> >> at
>> >> org.basex.query.QueryContext.parseMain(QueryContext.java:223)
>> >> at org.basex.query.QueryProcessor.parse(QueryProcessor.java:57)
>> >> at org.basex.core.cmd.AQuery.parse(AQuery.java:145)
>> >> at org.basex.core.cmd.AQuery.updates(AQuery.java:159)
>> >> at org.basex.core.cmd.AQuery.updating(AQuery.java:267)
>> >> at org.basex.core.Command.execute(Command.java:94)
>> >> at
>> >> org.basex.api.client.LocalSession.execute(LocalSession.java:132)
>> >> at org.basex.api.client.Session.execute(Session.java:36)
>> >> at org.basex.core.CLI.execute(CLI.java:103)
>> >> at org.basex.core.CLI.execute(CLI.java:87)
>> >> at org.basex.BaseX.console(BaseX.java:191)
>> >> at org.basex.BaseX.<init>(BaseX.java:166)
>> >> at org.basex.BaseX.main(BaseX.java:42)
>> >> Caused by: java.lang.InstantiationException:
>> >> org.basex.modules.CR_xquery_31_20151217
>> >> at java.lang.Class.newInstance(Unknown Source)
>> >> at
>> >> org.basex.query.util.pkg.ModuleLoader.addImport(ModuleLoader.java:124)
>> >> ... 16 more
>> >> Caused by: java.lang.NoSuchMethodException:
>> >> org.basex.modules.CR_xquery_31_20151217.<init>()
>> >> at java.lang.Class.getConstructor0(Unknown Source)
>> >> ... 18 more
>> >> org.basex.core.BaseXException: Stopped at ., 1/68:
>> >> [XQST0059] Could not instantiate
>> >> org.basex.modules.CR_xquery_31_20151217:
>> >> org.basex.modules.CR_xquery_31_20151217.
>> >> at org.basex.core.Command.execute(Command.java:101)
>> >> at
>> >> org.basex.api.client.LocalSession.execute(LocalSession.java:132)
>> >> at org.basex.api.client.Session.execute(Session.java:36)
>> >> at org.basex.core.CLI.execute(CLI.java:103)
>> >> at org.basex.core.CLI.execute(CLI.java:87)
>> >> at org.basex.BaseX.console(BaseX.java:191)
>> >> at org.basex.BaseX.<init>(BaseX.java:166)
>> >> at org.basex.BaseX.main(BaseX.java:42)
>> >> Caused by: org.basex.query.QueryException: Could not instantiate
>> >> org.basex.modules.CR_xquery_31_20151217:
>> >> org.basex.modules.CR_xquery_31_20151217.
>> >> at org.basex.query.QueryError.get(QueryError.java:1343)
>> >> at
>> >> org.basex.query.util.pkg.ModuleLoader.addImport(ModuleLoader.java:127)
>> >> at
>> >> org.basex.query.QueryParser.importModule(QueryParser.java:772)
>> >> at
>> >> org.basex.query.QueryParser.importModules(QueryParser.java:758)
>> >> at org.basex.query.QueryParser.parseMain(QueryParser.java:172)
>> >> at
>> >> org.basex.query.QueryContext.parseMain(QueryContext.java:223)
>> >> at org.basex.query.QueryProcessor.parse(QueryProcessor.java:57)
>> >> at org.basex.core.cmd.AQuery.parse(AQuery.java:145)
>> >> at org.basex.core.cmd.AQuery.updates(AQuery.java:159)
>> >> at org.basex.core.cmd.AQuery.updating(AQuery.java:267)
>> >> at org.basex.core.Command.execute(Command.java:94)
>> >> ... 7 more
>> >> Caused by: java.lang.InstantiationException:
>> >> org.basex.modules.CR_xquery_31_20151217
>> >> at java.lang.Class.newInstance(Unknown Source)
>> >> at
>> >> org.basex.query.util.pkg.ModuleLoader.addImport(ModuleLoader.java:124)
>> >> ... 16 more
>> >> Caused by: java.lang.NoSuchMethodException:
>> >> org.basex.modules.CR_xquery_31_20151217.<init>()
>> >> at java.lang.Class.getConstructor0(Unknown Source)
>> >> ... 18 more
>> >> Stopped at ., 1/68:
>> >> [XQST0059] Could not instantiate
>> >> org.basex.modules.CR_xquery_31_20151217:
>> >> org.basex.modules.CR_xquery_31_20151217.
>> >> >
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> On 7 April 2016 at 15:55, Christian Grün <christian.gruen@gmail.com>
>> >> wrote:
>> >>>
>> >>> > If instead I install it to the repo. It appears as
>> >>> > "org.basex.modules.CR_xquery_31_20151217"
>> >>> > but
>> >>> > import module namespace p="org.basex.modules.CR_xquery_31_20151217";
>> >>> > Fails with
>> >>> > Could not instantiate org.basex.modules.CR_xquery_31_20151217:
>> >>> > org.basex.modules.CR_xquery_31_20151217
>> >>> >
>> >>> > Any ideas where the problem could be?
>> >>>
>> >>> It sounds as if it’s not possible to create an instance of this class.
>> >>> Could you possibly forward the stack trace (triggered by -d)?
>> >>
>> >>
>> >
>
>