BaseX-Talk April 2015

basex-talk@mailman.uni-konstanz.de

32 participants
60 discussions

Bug? Local variable has not been allocated a stack frame slot
by Marc van Grootel 09 Apr '15

09 Apr '15

Hi, I have hit something which is related to Saxon XSLT. The XSLT in question runs fine standalone (via Oxygen). But when hooked up via RESTXQ I get the type of tracebacks (i've listed all traceback from where it enters Saxon code below). Although I don't have a full repro case I did manage to make it run by modyfing the expr inside the "group-starting-with". The code below uses a local variable $i in a predicate. This causes the error below. <xsl:for-each-group select="$v" group-starting-with="v[xs:integer(@c) eq $i][text()]"> ... </xsl:for-each-group> The code below runs without problems. Here it's not accessing the local variable inside the grouping attribute. <xsl:for-each-group select="$v" group-starting-with="v[text()]"> ... </xsl:for-each-group> Any idea if this is Saxon or BaseX issue? --Marc This is the top of the traceback. Version: BaseX 8.1 Java: Oracle Corporation, 1.7.0_25 OS: Windows 7, amd64 Stack Trace: java.lang.ArrayIndexOutOfBoundsException: Local variable $i has not been allocated a stack frame slot at net.sf.saxon.expr.LocalVariableReference.evaluateVariable(LocalVariableReference.java:102) at net.sf.saxon.expr.VariableReference.iterate(VariableReference.java:453) at net.sf.saxon.expr.SingletonAtomizer.evaluateItem(SingletonAtomizer.java:173) at net.sf.saxon.expr.SingletonAtomizer.evaluateItem(SingletonAtomizer.java:36) at net.sf.saxon.expr.ValueComparison.effectiveBooleanValue(ValueComparison.java:692) at net.sf.saxon.pattern.PatternWithPredicate.matches(PatternWithPredicate.java:139) at net.sf.saxon.pattern.PatternWithPredicate.matches(PatternWithPredicate.java:131) at net.sf.saxon.expr.sort.GroupStartingIterator.advance(GroupStartingIterator.java:47) at net.sf.saxon.expr.sort.GroupMatchingIterator.next(GroupMatchingIterator.java:75) at net.sf.saxon.expr.instruct.ForEachGroup.processLeavingTail(ForEachGroup.java:743) at net.sf.saxon.expr.instruct.Choose.processLeavingTail(Choose.java:875) at net.sf.saxon.expr.instruct.Instruction.process(Instruction.java:138) at net.sf.saxon.expr.instruct.UserFunction.process(UserFunction.java:382) at net.sf.saxon.expr.UserFunctionCall.process(UserFunctionCall.java:507) at net.sf.saxon.expr.instruct.Block.processLeavingTail(Block.java:662) at net.sf.saxon.expr.instruct.Instruction.process(Instruction.java:138) at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:431) at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:373) at net.sf.saxon.expr.instruct.Template.applyLeavingTail(Template.java:239) at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:1057) at net.sf.saxon.expr.instruct.ApplyTemplates$ApplyTemplatesPackage.processLeavingTail(ApplyTemplates.java:519) at net.sf.saxon.expr.instruct.CallTemplate.process(CallTemplate.java:349) at net.sf.saxon.expr.instruct.DocumentInstr.evaluateItem(DocumentInstr.java:323) at net.sf.saxon.expr.instruct.DocumentInstr.evaluateItem(DocumentInstr.java:56) at net.sf.saxon.expr.parser.ExpressionTool.evaluate(ExpressionTool.java:328) at net.sf.saxon.expr.LetExpression.eval(LetExpression.java:398) at net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:604) at net.sf.saxon.expr.instruct.Choose.processLeavingTail(Choose.java:875) at net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:613) at net.sf.saxon.expr.instruct.Choose.processLeavingTail(Choose.java:875) at net.sf.saxon.expr.instruct.Block.processLeavingTail(Block.java:660) at net.sf.saxon.expr.instruct.Template.expand(Template.java:258) at net.sf.saxon.expr.instruct.CallTemplate$CallTemplatePackage.processLeavingTail(CallTemplate.java:536) at net.sf.saxon.Controller.transformDocument(Controller.java:2082) at net.sf.saxon.Controller.transform(Controller.java:1903) at org.basex.query.func.xslt.XsltTransform.transform

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BaseX 8.1 cannot be deployed in a resin server
by George Karakatsiotis 08 Apr '15

08 Apr '15

Hi, While I have been able to deploy basex7.9+ to a resin web server, Basex 8.1 fails with a "Custom bean class 'org.basex.http.ServletListener' is abstract. Bean classes must be public, concrete, and have a zero-argument constructor." error message. Is there a reason why org.basex.http.ServletListener is abstract? I don't see any abstract methods and no other class is extending it. Thank you for your time, George Karakatsiotis

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BaseX under JBoss 6.2
by Bondeson, Carl 07 Apr '15

07 Apr '15

I have a deployment that is using 2 instances of BaseX. The first is using the default ports, then second is using alternate ports. Deploying the war goes smoothly, and both instances get along. When attempting to disable the deployment using the management console the process never completes. In looking at the log file the following error was noted. 10:00:31.159 SERVER admin OK Server was started. 10:02:19.876 SERVER admin Error: File 'C:/Users/DPHPIL~1/AppData/Local/Temp/BaseXServer1984' could not be deleted. It seems that even though the second instance is using 1982 as the port, the default port is being in this transaction. The versions in use are 7.6 and 7.9. Is there something from a configuration standpoint that needs to be set in order for the shutdown process to use the correct, non-default port? Carl R Bondeson Systems Developer Department of Public Health Data Processing 410 Capitol Ave Hartford, CT 06134 Phone: 860-509-7434 carl.bondeson(a)ct.gov<mailto:carl.bondeson@ct.gov> [Description: DPH Logo - Keeping CT Healthy]<http://www.ct.gov/dph>

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Used memory value
by Joseph 07 Apr '15

07 Apr '15

Hi, When I open Basex 8.3 GUI, the value of the used memory keeps growing up/changing fast, even though I do not do anything. Since this does not happen with Basex 7.9, is this due to Java? (I run Java 1.8.X) Thanks, Joseph

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%unit:ignore broken since 8.0?
by Marc van Grootel 07 Apr '15

07 Apr '15

Hi, Could it be that %unit:ignore("message") is broken since 8.0. Whenever I use a message in the annotation my tests fail with this error message: <error line="149" column="21" type="bxerr:BASX0006"> <info>%unit:ignore: 1 argument supplied.</info> </error> When ("mesage") is removed the test is ok. Documentation let's me believe %unit:ignore("message") is still supported. --Marc

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Truncated results
by Joseph 07 Apr '15

07 Apr '15

Hi, I have noticed that when using the update facility, for example the replace expression, results for a long file may be cut off. This however does not happen if I use the non-updating expression (copy/modify): does this make sense to you? Thanks. Joseph

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exception
by Ertan Tike 07 Apr '15

07 Apr '15

Hi, I'm trying to optimize all previously existing databases created with older versions of basex. I have tried couple of different scenarios but all failed with an error message. How can I fix this error ? I have executed the following query for $d in db:list() return db:optimize($d, true(), map { 'autooptimize' : true(), 'updindex' : true() } ) but on some databases i get following error: Error: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.1 Stack Trace: java.lang.ArrayIndexOutOfBoundsException at org.basex.io.random.TableDiskAccess.fpre(TableDiskAccess.java:503) at org.basex.io.random.TableDiskAccess.cursor(TableDiskAccess.java:455) at org.basex.io.random.TableDiskAccess.read1(TableDiskAccess.java:148) at org.basex.data.Data.kind(Data.java:307) at org.basex.query.value.node.DBNode.<init>(DBNode.java:53) at org.basex.core.cmd.OptimizeAll$DBParser.parse(OptimizeAll.java:201) at org.basex.build.Builder.parse(Builder.java:75) at org.basex.build.DiskBuilder.build(DiskBuilder.java:87) at org.basex.core.cmd.OptimizeAll.optimizeAll(OptimizeAll.java:130) at org.basex.query.up.primitives.db.DBOptimize.apply(DBOptimize.java:102) at org.basex.query.up.DataUpdates.apply(DataUpdates.java:175) at org.basex.query.up.ContextModifier.apply(ContextModifier.java:126) at org.basex.query.up.Updates.apply(Updates.java:134) at org.basex.query.QueryContext.iter(QueryContext.java:364) at org.basex.query.QueryContext.execute(QueryContext.java:605) at org.basex.query.QueryProcessor.execute(QueryProcessor.java:98) at org.basex.core.cmd.AQuery.query(AQuery.java:83) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:379) at org.basex.core.Command.execute(Command.java:95) at org.basex.gui.GUI.exec(GUI.java:467) at org.basex.gui.GUI.access$400(GUI.java:41) at org.basex.gui.GUI$7.run(GUI.java:410) Thank you -- Ertan TİKE <http://www.6kare.com>

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BenchX - The curious case of query number 9
by Andy Bunce 07 Apr '15

07 Apr '15

Hi, This is a follow up to the benchmarking work I presented at the user meeting in Prague. I have made some changes to my BenchX application to allow the split option (-s) of xmgen to be used. http://www.xml-benchmark.org/faq.txt I have compared the timings for databases created from sources with and without the -s option. In principle these should provide very similar results. xmlgen /f 0.2 /o folder/auction xmlgen /f 0.2 /o folder/auction /s 400 In the first case a single file auction is created. In the second 35 files (auction00000... auction00034) are created. In both cases the file or files are loaded to a single database to query. In most cases the query performance is very similar. The exception is q09.xq. This appears to be 2 or 3 orders of magnitude slower against the database created from the split sources. The actual query result seems to be the same. I have seen the same performance effect for factors f= 0.2, 0.5, 1 but not the somewhat trival f=0. Any idea what is happening here? Regards /Andy --q09.xq--------- let $auction := collection("benchx-db") return let $ca := $auction/site/closed_auctions/closed_auction return let $ei := $auction/site/regions/europe/item for $p in $auction/site/people/person let $a := for $t in $ca where $p/@id = $t/buyer/@person return let $n := for $t2 in $ei where $t/itemref/@item = $t2/@id return $t2 return <item>{$n/name/text()}</item> return <person name="{$p/name/text()}">{$a}</person>

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xqdoc and basex system modules
by Andy Bunce 07 Apr '15

07 Apr '15

I am looking to generate documentation from the system module stubs in etc/modules.zip. I have two issues 1) There is an issue with inspect.xqm declare namespace xqdoc="http://www.xqdoc.org/1.0"; let $a:=inspect:xqdoc("inspect.xqm")//xqdoc:function[xqdoc:name='inspect:xqdoc']//xqdoc:description return parse-xml-fragment($a) Errors And xqdoc:description looks like <xqdoc:description xmlns:xqdoc="http://www.xqdoc.org/1.0"></code> and end with <code></code> , and tags start with <code>@</code> . xqDoc comments can be specified for main and library modules and variable and function declarations. <p>We have slightly extended the xqDoc conventions to do justice to the current status of XQuery (Schema: <a href=" http://files.basex.org/etc/xqdoc-1.1.30052013.xsd ">xqdoc-1.1.30052013.xsd</a>): </p> <ul> <li> an <code>&lt;xqdoc:annotations/&gt;</code> node is added to each variable or function that uses annotations. The xqdoc:annotation child nodes may have additional <code>xqdoc:literal</code> elements with <code>type</code> attributes (xs:string, xs:integer, xs:decimal, xs:double) and values. </li> <li> a single <code>&lt;xqdoc:namespaces/&gt;</code> node is added to the root element, which summarizes all prefixes and namespace URIs used or declared in the module. </li> <li> name and type elements are added to variables </li> </ul></xqdoc:description> A comment parsing/escaping issue? 2) inspect:xqdoc("array.xqm") and the same with map.xqm Function 'array:size' is in reserved namespace. I guess this is to be expected and maybe I should just ignore any modules in namespaces http://www.w3.org/... I guess it is a result of the code being compiled rather than just documented? /Andy

2 3

Path Summary order
by Cecil Tarasoff 02 Apr '15

02 Apr '15

Hi BaseX Gurus, Thanks for such a powerful reporting tool. I am still a newbie to XML and I would be lost without BaseX. Thank-you! I was wondering whether there is any way to have the path summary output it's result in alphabetical sequence of attributes and then elements? I export the path summary from different versions of the XML and use BeyondCompare to reveal the differences but the inconsistent ordering of the elements and attributes makes this a bit of a challenge. It would be really handy for me if there were an option available where I could elect to output the Path Summary with the attributes sorted alphabetically followed by the elements also in alphabetical order (within their parent). If you could consider this for a future enhancement I would be forever grateful. Of course, if there is an easier way for me to compare XML structure, I would love to know the tricks! Thanks again for your dedication to this os product. Cecil Tarasoff

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BaseX-Talk April 2015