When I use the Code Macro with another language than “none” I get an error:
Failed to execute the [code] macro. Cause: [Failed to find engine for Python script language].
I guess that I have to install something. I use the Tomcat installation. Do I have to install Jython or a Python environment? Do I have to configure it to be used by XWiki?
No you don’t need to install anything since Jython is embedded in the XWiki WAR.
Could you check if you have jython-standalone jar in WEB-INF/lib/ ?
What version of XWiki do you use ? There was an issue in 9.5.
I use 9.9. The jar exists: /usr/lib/xwiki/WEB-INF/lib/jython-standalone-2.7.1-xwiki-2.jar
Then it does not make much sense to me, works fine for me on 9.9 and that’s the first time I see someone reporting an issue like this. Did you try to restart the application server ? Do you have any more error in the log at startup or the first time you use the code or python macros ?
Wow - thanks bjoerne! I’d just about given up hope. I’ve been having the same issue and thought it was a problem with the import from an old Wiki. In the end I tried a new Ubuntu 16.04 installation with Oracle Java 8 and the xwiki-tomcat8-mysql package. Same issue! Can’t use the code macro at all! At least I know using “none” as the code type fixes it!
@crazzyfool you have /usr/lib/xwiki/WEB-INF/lib/jython-standalone-2.7.1-xwiki-2.jar file too ?
Do you have any error in the log et startup or before executing the macro ?
I don’t reproduce myself with xwiki-tomcat8-mysql 9.9 on both Ubuntu 17.04 and 14.04.
Could you try the following content in a wiki page
{{groovy}}
println org.python.jsr223.PyScriptEngineFactory.class
{{/groovy}}
The output is “class org.python.jsr223.PyScriptEngineFactory”
I use XWiki 9.9 on Ubuntu 16.04.3 with openjdk-8.
There is only one warning/error at start time:
SEVERE: Unable to process Jar entry [module-info.class] from Jar [jar:file:/usr/lib/xwiki/WEB-INF/lib/jaxb-api-2.3.0.jar!/] for annotations
org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19
at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:97)
at org.apache.tomcat.util.bcel.classfile.ConstantPool.<init>(ConstantPool.java:55)
at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:176)
at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:85)
at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2045)
at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1991)
at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1961)
at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1915)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1158)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:780)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5154)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:585)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1794)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Are python and groovy macros working ?
{{groovy}}
print "groovy"
{{/groovy}}
{{python}}
print "python"
{{/python}}
Groovy works. Output “groovy”
Python doesn’t work: Failed to execute the [python] macro. Cause: [Can’t find script engine with name [python]]. Click on this message for details.
org.xwiki.rendering.macro.MacroExecutionException: Can't find script engine with name [python]
at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluateBlock(AbstractJSR223ScriptMacro.java:196)
at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluateBlock(AbstractJSR223ScriptMacro.java:60)
at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:182)
at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:58)
at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:272)
at org.xwiki.rendering.internal.transformation.DefaultRenderingContext.transformInContext(DefaultRenderingContext.java:183)
at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:95)
at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:263)
at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:133)
at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:58)
at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:96)
at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:39)
at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:123)
at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:52)
at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:68)
at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:42)
at com.xpn.xwiki.doc.XWikiDocument.display(XWikiDocument.java:1160)
at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:1201)
at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:1178)
at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:1209)
at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:713)
at sun.reflect.GeneratedMethodAccessor727.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.xwiki.velocity.introspection.TryCatchDirective.render(TryCatchDirective.java:87)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluateInternal(DefaultVelocityEngine.java:259)
at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:222)
at com.xpn.xwiki.render.DefaultVelocityManager.evaluate(DefaultVelocityManager.java:361)
at com.xpn.xwiki.internal.template.InternalTemplateManager.evaluateContent(InternalTemplateManager.java:806)
at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:682)
at com.xpn.xwiki.internal.template.InternalTemplateManager.lambda$renderFromSkin$0(InternalTemplateManager.java:657)
at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:85)
at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:656)
at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:635)
at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:621)
at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:78)
at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2162)
at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:2140)
at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:969)
at sun.reflect.GeneratedMethodAccessor291.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:369)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluateInternal(DefaultVelocityEngine.java:259)
at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:222)
at com.xpn.xwiki.render.DefaultVelocityManager.evaluate(DefaultVelocityManager.java:361)
at com.xpn.xwiki.internal.template.InternalTemplateManager.evaluateContent(InternalTemplateManager.java:806)
at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:682)
at com.xpn.xwiki.internal.template.InternalTemplateManager.lambda$renderFromSkin$0(InternalTemplateManager.java:657)
at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:85)
at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:656)
at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:635)
at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:621)
at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:78)
at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2162)
at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:2140)
at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:969)
at sun.reflect.GeneratedMethodAccessor291.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:369)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluateInternal(DefaultVelocityEngine.java:259)
at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:222)
at com.xpn.xwiki.render.DefaultVelocityManager.evaluate(DefaultVelocityManager.java:361)
at com.xpn.xwiki.internal.template.InternalTemplateManager.evaluateContent(InternalTemplateManager.java:806)
at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:682)
at com.xpn.xwiki.internal.template.InternalTemplateManager.lambda$renderFromSkin$0(InternalTemplateManager.java:657)
at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:85)
at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:656)
at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:635)
at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:621)
at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:78)
at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2162)
at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:180)
at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:463)
at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:210)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:112)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.xwiki.wysiwyg.filter.ConversionFilter.doFilter(ConversionFilter.java:127)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:134)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1504)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1460)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
So the engine is there but Java cannot find it for some reason.
Could you try the following:
{{groovy}}
println new javax.script.ScriptEngineManager().engineFactories
{{/groovy}}
Thanks for your patience 
Output: [org.python.jsr223.PyScriptEngineFactory@418e8fd, jdk.nashorn.api.scripting.NashornScriptEngineFactory@631e0cd3, org.codehaus.groovy.jsr223.GroovyScriptEngineFactory@4775dc98]
Looks good so far…
Something else to test:
{{groovy}}
new javax.script.ScriptEngineManager().engineFactories.each() {
println "* $it"
println "** names: ${it.names}"
}
{{/groovy}}
After that I’m going to be running out of ideas.
And
{{groovy}}
println new javax.script.ScriptEngineManager().getEngineByName('python')
{{/groovy}}I failed to make it work with tomcat8 installation but tomcat7 worked fine. Also something was wrong with my Java installation which I used for other purposes so I installed java along the xwiki Ubuntu package:
deb http://maven.xwiki.org stable/
package: “xwiki-tomcat7-mysql”
The error was caused when jython tried to load the site python module which is not available in my installation.
The solution was to set the Java property python.import.site to false. I added the following line to the tomcat8 file:
JAVA_OPTS="${JAVA_OPTS} -Dpython.import.site=false"
After the fix I was able to execute successfully
{{python}}
print "python"
{{/python}}
But the Code Macro still doesn’t work. It causes a
java.lang.StringIndexOutOfBoundsException: String index out of range: 3
This is thrown when Tomcat tries to load a class org. This issue is mentioned in several tickets:
It should be fixed in Tomcat 8.0.33, but my Tomcat version on Ubuntu 16.04.3 is still 8.0.32-1ubuntu1.4. I guess I have to wait until there is an update available.
This is very weird since you definitely don’t need anything in the system side to use Jython in XWiki. As for the site module it’s part of jython-standalone JAR file in any cases.
Looks more like a classloader issue which makes Jython unable to find resources located in his JAR in Lib/ folder. Are you able to import other standard modules like math ?
Maybe you could try with Tomcat 7.
It happens when loading org.python.core. In org.python.core.imp.import_module_level() the first package part (= org) is tried to be loaded. A bit weird, but usually no problem. It fails only because of the Tomcat8 bug.
i have exactly the same problem as bjoerne. I am also stuck now with the code macro with the “String index out of range: 3” error message after adding the line in tomcat8 file as suggested by bjoerne.
See Bug #1644144 “Tomcat 8.0.32 has ClassLoader Issues” : Bugs : tomcat8 package : Ubuntu for Ubuntu side bug. Loading... has been create to follow progress on this issue.
The following ppa is supposed to contain a fixed version of Tomcat 8: Test fixes for tomcat8 bugs : Nish Aravamudan. Would be great if someone could test it.