Hello, In ScriptMacro parameters description http://code.xwiki.org/xwiki/bin/view/Macros/ScriptMacro#HSpecifyingextraJARs It write that we can attach a jar in page and add it to classpath with jars parameter {{script jars="attach:some.jar"}} When I do that, my page is never displayed: my browser waits and waits page content I try also {{script jars="http://host/xwiki/bin/download/space/page/some.jar"}} Then I have the following error: Failed to execute macro: script java.lang.NoClassDefFoundError: Could not initialize class sun.net.www.protocol.http.HttpURLConnection        at sun.net.www.protocol.http.Handler.openConnection(Handler.java:44)        at sun.net.www.protocol.http.Handler.openConnection(Handler.java:39)        at java.net.URL.openConnection(URL.java:945)        at org.xwiki.classloader.internal.protocol.jar.JarURLConnection.getPermission(JarURLConnection.java:114)        at org.xwiki.classloader.internal.ResourceLoader$JarInfo.getJarFileIfPossiblyContains(ResourceLoader.java:533)        at org.xwiki.classloader.internal.ResourceLoader$JarInfo.getResource(ResourceLoader.java:429)        at org.xwiki.classloader.internal.ResourceLoader.findResource(ResourceLoader.java:356)        at org.xwiki.classloader.internal.ResourceLoader.access$400(ResourceLoader.java:89)        at org.xwiki.classloader.internal.ResourceLoader$ResourceEnumeration.fetchNext(ResourceLoader.java:811)        at org.xwiki.classloader.internal.ResourceLoader$ResourceEnumeration.hasMoreElements(ResourceLoader.java:792)        at sun.misc.CompoundEnumeration.next(CompoundEnumeration.java:27)        at sun.misc.CompoundEnumeration.hasMoreElements(CompoundEnumeration.java:36)        at sun.misc.Service$LazyIterator.hasNext(Service.java:255)        at javax.script.ScriptEngineManager.initEngines(ScriptEngineManager.java:107)        at javax.script.ScriptEngineManager.access$000(ScriptEngineManager.java:37)        at javax.script.ScriptEngineManager$1.run(ScriptEngineManager.java:80)        at java.security.AccessController.doPrivileged(Native Method)        at javax.script.ScriptEngineManager.init(ScriptEngineManager.java:78)        at javax.script.ScriptEngineManager.<init>(ScriptEngineManager.java:51)        at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.getScriptEngine(AbstractJSR223ScriptMacro.java:239)        at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluate(AbstractJSR223ScriptMacro.java:181)        at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluate(AbstractJSR223ScriptMacro.java:50)        at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:200)        at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.execute(AbstractJSR223ScriptMacro.java:137)        at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.execute(AbstractJSR223ScriptMacro.java:50)        at org.xwiki.rendering.internal.transformation.MacroTransformation.transformOnce(MacroTransformation.java:175)        at org.xwiki.rendering.internal.transformation.MacroTransformation.transform(MacroTransformation.java:120)        at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:72)        at com.xpn.xwiki.doc.XWikiDocument.performSyntaxConversion(XWikiDocument.java:5586)        at com.xpn.xwiki.doc.XWikiDocument.performSyntaxConversion(XWikiDocument.java:5561)        at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:557)        at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:571)        at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:475)        at sun.reflect.GeneratedMethodAccessor337.invoke(Unknown Source)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)        at java.lang.reflect.Method.invoke(Method.java:597)        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)        at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)        at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)        at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:493)        at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)        at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)        at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)        at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)        at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:191)        at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:156)        at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:108)        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1703)        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1624)        at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:657)        at sun.reflect.GeneratedMethodAccessor139.invoke(Unknown Source)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)        at java.lang.reflect.Method.invoke(Method.java:597)        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)        at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)        at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)        at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:332)        at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)        at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:212)        at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:247)        at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175)        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:336)        at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)        at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:191)        at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:156)        at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:108)        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1703)        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1624)        at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:124)        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224)        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115)        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)        at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)        at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:152)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)        at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:117)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)        at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)        at com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:295)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)        at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)        at java.lang.Thread.run(Thread.java:619)