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Why the definition of REGEXP substitutions in Tiles causes an infinite jsp, including an error

I use tiles 2.2.2 with Struts2 2.2.3, since the Struts2-Tiles plugin is quite old, its implementation uses a lot of deprecated Tiles APIs, and I want to try the REGEXP template, so I will implement my own listener below:

MyTilesContainerFactory

package tiles; import org.apache.tiles.definition.pattern.DefinitionPatternMatcherFactory; import org.apache.tiles.definition.pattern.PatternDefinitionResolver; import org.apache.tiles.definition.pattern.PrefixedPatternDefinitionResolver; import org.apache.tiles.definition.pattern.regexp.RegexpDefinitionPatternMatcherFactory; import org.apache.tiles.definition.pattern.wildcard.WildcardDefinitionPatternMatcherFactory; import org.apache.tiles.factory.BasicTilesContainerFactory; public class MyTilesContainerFactory extends BasicTilesContainerFactory { @Override protected <T> PatternDefinitionResolver<T> createPatternDefinitionResolver(Class<T> customizationKeyClass) { DefinitionPatternMatcherFactory wildcardFactory = new WildcardDefinitionPatternMatcherFactory(); DefinitionPatternMatcherFactory regexpFactory = new RegexpDefinitionPatternMatcherFactory(); PrefixedPatternDefinitionResolver<T> resolver = new PrefixedPatternDefinitionResolver<T>(); resolver.registerDefinitionPatternMatcherFactory("WILDCARD", wildcardFactory); resolver.registerDefinitionPatternMatcherFactory("REGEXP", regexpFactory); return resolver; } }

MyTilesInitializer

 package tiles; import org.apache.tiles.TilesApplicationContext; import org.apache.tiles.factory.AbstractTilesContainerFactory; import org.apache.tiles.startup.AbstractTilesInitializer; public class MyTilesInitializer extends AbstractTilesInitializer { @Override protected AbstractTilesContainerFactory createContainerFactory(TilesApplicationContext context) { return new MyTilesContainerFactory(); } }

MyTilesListener

 package tiles; import org.apache.tiles.startup.TilesInitializer; import org.apache.tiles.web.startup.AbstractTilesListener; public class MyTilesListener extends AbstractTilesListener { @Override protected TilesInitializer createTilesInitializer() { return new MyTilesInitializer(); } }

Then I define my tiles.xml file

 <tiles-definitions> <definition name="REGEXP:(.*)" template="/WEB-INF/tiles/basicLayout.jsp"> <put-attribute name="header" value="/WEB-INF/tiles/header.jsp" /> <put-attribute name="content" value="/WEB-INF/pages/{1}.jsp" /> <put-attribute name="footer" value="/WEB-INF/tiles/footer.jsp" /> </definition> </tiles-definitions>

When I try to perform an action that returns the result of fragmentation, it ends in an infinite loop, the jsp error turns on.

 SEVERE: Servlet.service() for servlet jsp threw exception java.lang.StackOverflowError at java.io.UnixFileSystem.getBooleanAttributes0(Native Method) at java.io.UnixFileSystem.getBooleanAttributes(UnixFileSystem.java:228) at java.io.File.exists(File.java:733) at sun.misc.URLClassPath$FileLoader.getResource(URLClassPath.java:999) at sun.misc.URLClassPath.getResource(URLClassPath.java:169) at java.net.URLClassLoader$1.run(URLClassLoader.java:194) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632) at java.lang.ClassLoader.defineClass(ClassLoader.java:616) 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:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at org.apache.jasper.compiler.ErrorDispatcher.createJavacError(ErrorDispatcher.java:526) at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:490) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:638) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:632) at org.apache.tiles.jsp.context.JspTilesRequestContext.include(JspTilesRequestContext.java:103) at org.apache.tiles.jsp.context.JspTilesRequestContext.dispatch(JspTilesRequestContext.java:96) at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321) at org.apache.tiles.renderer.impl.DefinitionAttributeRenderer.write(DefinitionAttributeRenderer.java:56) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.renderer.impl.ChainedDelegateAttributeRenderer.write(ChainedDelegateAttributeRenderer.java:76) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:336) at org.apache.tiles.template.InsertAttributeModel.renderAttribute(InsertAttributeModel.java:210) at org.apache.tiles.template.InsertAttributeModel.end(InsertAttributeModel.java:126) at org.apache.tiles.jsp.taglib.InsertAttributeTag.doTag(InsertAttributeTag.java:311) at org.apache.jsp.WEB_002dINF.tiles.basicLayout_jsp._jspx_meth_tiles_005finsertAttribute_005f0(basicLayout_jsp.java:128) at org.apache.jsp.WEB_002dINF.tiles.basicLayout_jsp._jspService(basicLayout_jsp.java:93) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:638) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:632) at org.apache.tiles.jsp.context.JspTilesRequestContext.include(JspTilesRequestContext.java:103) at org.apache.tiles.jsp.context.JspTilesRequestContext.dispatch(JspTilesRequestContext.java:96) at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321) at org.apache.tiles.renderer.impl.DefinitionAttributeRenderer.write(DefinitionAttributeRenderer.java:56) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.renderer.impl.ChainedDelegateAttributeRenderer.write(ChainedDelegateAttributeRenderer.java:76) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:336) at org.apache.tiles.template.InsertAttributeModel.renderAttribute(InsertAttributeModel.java:210) at org.apache.tiles.template.InsertAttributeModel.end(InsertAttributeModel.java:126) at org.apache.tiles.jsp.taglib.InsertAttributeTag.doTag(InsertAttributeTag.java:311) at org.apache.jsp.WEB_002dINF.tiles.basicLayout_jsp._jspx_meth_tiles_005finsertAttribute_005f0(basicLayout_jsp.java:128) at org.apache.jsp.WEB_002dINF.tiles.basicLayout_jsp._jspService(basicLayout_jsp.java:93) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

Can anyone give me some advice? I must say that if I did not use the definition of wildcards, then the same definition works great. Thank you very much.

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I did not quite work it out to my satisfaction, but I hope this helps. The regular expression you use is probably the most greedy expression you could use. It matches everything, and this includes everything inside the tile definition itself (basicLayout.jsp, header.jsp, footer.jsp). This explains why you get an infinite loop, since your REGEXP tile definition maintains compliance with each file request and tries to satisfy each new file request with a new template call (template recursion!).

The Tiles lookup support page page shows some examples. None of these examples use (. *) . I think we just figured out why this might be.

You will need to make your REGEXP a little less greedy; I know that Struts uses a slightly different approach to invoke template templates, but imagine you have a JSP page containing:

 <%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %> <tiles:insertDefinition name="somepage.tile" />

and the following tile definition is to create your template page wrapped around the contents of / WEB -INF / pages / somepage.jsp:

 <definition name="REGEXP:(.*)\.tile" template="/WEB-INF/tiles/basicLayout.jsp"> <put-attribute name="header" value="/WEB-INF/tiles/header.jsp" /> <put-attribute name="content" value="/WEB-INF/pages/{1}.jsp" /> <put-attribute name="footer" value="/WEB-INF/tiles/footer.jsp" /> </definition>
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