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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomee.catalina;
import org.apache.catalina.core.StandardContext;
import org.apache.openejb.util.doc.Revisit;
/**
* @version $Rev$ $Date$
*/
@Revisit("this is here to work around LinkageErrors that can occur - seems most often in mac")
public class LinkageErrorProtection {
public static void preload(final StandardContext standardContext) {
try {
final String[] classNames = {
"javax.servlet.jsp.ErrorData",
"javax.servlet.jsp.HttpJspPage",
"javax.servlet.jsp.JspApplicationContext",
"javax.servlet.jsp.JspContext",
"javax.servlet.jsp.JspEngineInfo",
"javax.servlet.jsp.JspException",
"javax.servlet.jsp.JspFactory",
"javax.servlet.jsp.JspPage",
"javax.servlet.jsp.JspTagException",
"javax.servlet.jsp.JspWriter",
"javax.servlet.jsp.PageContext",
"javax.servlet.jsp.SkipPageException",
"javax.servlet.jsp.el.ELException",
"javax.servlet.jsp.el.ELParseException",
"javax.servlet.jsp.el.Expression",
"javax.servlet.jsp.el.ExpressionEvaluator",
"javax.servlet.jsp.el.FunctionMapper",
"javax.servlet.jsp.el.ImplicitObjectELResolver$1",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$1",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$10",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$2",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$3",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$4",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$5",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$6",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$7",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$8",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager$9",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeManager",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeMap$ScopeEntry",
"javax.servlet.jsp.el.ImplicitObjectELResolver$ScopeMap",
"javax.servlet.jsp.el.ImplicitObjectELResolver",
"javax.servlet.jsp.el.ScopedAttributeELResolver",
"javax.servlet.jsp.el.VariableResolver",
"javax.servlet.jsp.tagext.BodyContent",
"javax.servlet.jsp.tagext.BodyTag",
"javax.servlet.jsp.tagext.BodyTagSupport",
"javax.servlet.jsp.tagext.DynamicAttributes",
"javax.servlet.jsp.tagext.FunctionInfo",
"javax.servlet.jsp.tagext.IterationTag",
"javax.servlet.jsp.tagext.JspFragment",
"javax.servlet.jsp.tagext.JspIdConsumer",
"javax.servlet.jsp.tagext.JspTag",
"javax.servlet.jsp.tagext.PageData",
"javax.servlet.jsp.tagext.SimpleTag",
"javax.servlet.jsp.tagext.SimpleTagSupport",
"javax.servlet.jsp.tagext.Tag",
"javax.servlet.jsp.tagext.TagAdapter",
"javax.servlet.jsp.tagext.TagAttributeInfo",
"javax.servlet.jsp.tagext.TagData",
"javax.servlet.jsp.tagext.TagExtraInfo",
"javax.servlet.jsp.tagext.TagFileInfo",
"javax.servlet.jsp.tagext.TagInfo",
"javax.servlet.jsp.tagext.TagLibraryInfo",
"javax.servlet.jsp.tagext.TagLibraryValidator",
"javax.servlet.jsp.tagext.TagSupport",
"javax.servlet.jsp.tagext.TagVariableInfo",
"javax.servlet.jsp.tagext.TryCatchFinally",
"javax.servlet.jsp.tagext.ValidationMessage",
"javax.servlet.jsp.tagext.VariableInfo",
};
for (final String className : classNames) {
try {
load(className, standardContext);
} catch (final Throwable e) {
// no-op
}
}
} catch (final Throwable e) {
// not critical, this is only to avoid possible jsp LinkageError in Oracle JDK 1.6
}
}
private static void load(final String className, final StandardContext standardContext) {
final ClassLoader classLoader = standardContext.getLoader().getClassLoader();
try {
classLoader.loadClass(className);
} catch (final ClassNotFoundException e) {
// no-op
} catch (final LinkageError e) {
try {
classLoader.loadClass(className);
} catch (final ClassNotFoundException e2) {
// no-op
}
}
}
/*
Here's what the LinkageError looks like
SEVERE: Servlet.service() for servlet [jsp] in context with path [/mywebapp] threw exception [java.lang.LinkageError: loader (instance of org/apache/catalina/loader/StandardClassLoader): attempted duplicate class definition for name: "javax/servlet/jsp/JspWriter"] with root cause
java.lang.LinkageError: loader (instance of org/apache/catalina/loader/StandardClassLoader): attempted duplicate class definition for name: "javax/servlet/jsp/JspWriter"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.privateGetPublicMethods(Class.java:2547)
at java.lang.Class.getMethods(Class.java:1410)
at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1284)
at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1158)
at java.beans.Introspector.getBeanInfo(Introspector.java:408)
at java.beans.Introspector.getBeanInfo(Introspector.java:167)
at org.apache.jasper.compiler.Generator$TagHandlerInfo.(Generator.java:3932)
at org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2207)
at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1635)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1539)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Generator.generate(Generator.java:3485)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:249)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:372)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:352)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:339)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:601)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:344)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:403)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:301)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:162)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:140)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
*/
}
