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Type: Bug
Resolution: Fixed
Priority: Normal
Fix Version/s: 8.5.0
Affects Version/s: 8.0.5
Component/s: Container
Security Level: Jimmy
Labels:
- EL
- tomcat
- zel
Environment:

tomcat >=7.0.100
tomcat >=8.5.51
tomcat >=9.0.31

error doesn't happen since zk 8.5

Steps to Reproduce

display any EL in a zul file:

<zk>
   ${desktop.id}
</zk>

Current Result

org.zkoss.zel.ELException: Unable to find ExpressionFactory of type: # Licensed to the Apache Software Foundation (ASF) under one or more
	org.zkoss.zel.ExpressionFactory.newInstance(ExpressionFactory.java:167)
	org.zkoss.zel.ExpressionFactory.newInstance(ExpressionFactory.java:106)
	org.zkoss.zel.Util.getExpressionFactory(Util.java:126)
	org.zkoss.zel.ELManager.getExpressionFactory(ELManager.java:30)
	org.zkoss.zel.ELContext.convertToType(ELContext.java:306)
	org.zkoss.zel.impl.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
	org.zkoss.xel.zel.ELXelExpression.evaluate(ELXelExpression.java:41)
	org.zkoss.zk.xel.impl.SimpleEvaluator.evaluate(SimpleEvaluator.java:68)
	org.zkoss.zk.ui.metainfo.AbstractEvalRef.evaluate(AbstractEvalRef.java:46)
	org.zkoss.zk.xel.ExValue.getValue(ExValue.java:111)
	org.zkoss.zk.ui.metainfo.Property.getValue(Property.java:138)
	org.zkoss.zk.ui.metainfo.Property.assign0(Property.java:234)
	org.zkoss.zk.ui.metainfo.Property.assign(Property.java:174)
	org.zkoss.zk.ui.metainfo.ComponentInfo.applyProperties(ComponentInfo.java:742)
	org.zkoss.zk.ui.impl.AbstractUiFactory.newComponent(AbstractUiFactory.java:146)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:919)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:889)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:776)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:836)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:794)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:740)
	org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:461)
	org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:369)
	org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:211)
	org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:137)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause

java.lang.ClassNotFoundException: # Licensed to the Apache Software Foundation (ASF) under one or more
	org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)
	org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
	org.zkoss.zel.ExpressionFactory.newInstance(ExpressionFactory.java:160)
	org.zkoss.zel.ExpressionFactory.newInstance(ExpressionFactory.java:106)
	org.zkoss.zel.Util.getExpressionFactory(Util.java:126)
	org.zkoss.zel.ELManager.getExpressionFactory(ELManager.java:30)
	org.zkoss.zel.ELContext.convertToType(ELContext.java:306)
	org.zkoss.zel.impl.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
	org.zkoss.xel.zel.ELXelExpression.evaluate(ELXelExpression.java:41)
	org.zkoss.zk.xel.impl.SimpleEvaluator.evaluate(SimpleEvaluator.java:68)
	org.zkoss.zk.ui.metainfo.AbstractEvalRef.evaluate(AbstractEvalRef.java:46)
	org.zkoss.zk.xel.ExValue.getValue(ExValue.java:111)
	org.zkoss.zk.ui.metainfo.Property.getValue(Property.java:138)
	org.zkoss.zk.ui.metainfo.Property.assign0(Property.java:234)
	org.zkoss.zk.ui.metainfo.Property.assign(Property.java:174)
	org.zkoss.zk.ui.metainfo.ComponentInfo.applyProperties(ComponentInfo.java:742)
	org.zkoss.zk.ui.impl.AbstractUiFactory.newComponent(AbstractUiFactory.java:146)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:919)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:889)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:776)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:836)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:794)
	org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:740)
	org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:461)
	org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:369)
	org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:211)
	org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:137)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Expected Result

no error

Debug Information

related tomcat issue: https://bz.apache.org/bugzilla/show_bug.cgi?id=64097

in 8.0.5:
The method org.zkoss.zel.ExpressionFactory#getClassNameServices reads the service config file (META-INF/services/javax.el.ExpressionFactory)
and fails to ignore comments after a '#'.
instead it simply returns the first non empty line it finds (in the error case a license comment)

https://github.com/zkoss/zk/blob/v8.0.5/zel/src/org/zkoss/zel/ExpressionFactory.java#L411-L421

Workaround

create a file (e.g. in a standard maven war project)
src/main/resources/META-INF/services/javax.el.ExpressionFactory

with the content:

org.zkoss.zel.impl.ExpressionFactoryImpl

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relates to

ZK-3642 ZK can't work with Java unified expression language standard implementation

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Details

Description

Steps to Reproduce

Current Result

Expected Result

Debug Information

Workaround

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