为什么Tiles REGEXP通配符定义导致无尽的jsp包括错误 [英] Why Tiles REGEXP wildcard definition cause endless jsp including error
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问题描述
我使用 Struts2 2.2.3 的 tile 2.2.2，由于 Struts2-Tiles 插件相当老，它的实现使用了许多不推荐使用的 Tiles API，我想尝试 REGEXP 通配符，所以我在下面实现了我自己的监听器:
I use tiles 2.2.2 with Struts2 2.2.3, since Struts2-Tiles plugin is quite old, its implementation uses many Tiles deprecated API, and I want to try REGEXP wildcard, so I 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();
}
}
然后我定义我的tiles.xml
Then I define my tiles.xml
<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>
当我尝试一个返回图块结果的操作时，它以无限循环结束，jsp 包含错误.
When I try a action that returns a tiles result, it ends up with an infinite loop, a jsp include error.
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)
有人可以给我建议吗?我不得不说，如果我不使用通配符定义，同样的定义也可以正常工作.非常感谢.
Could any one give me advice? I have to say that if I didn't use wildcard definition, the same definition works fine. Thanks a lot.
推荐答案
我还没有完全解决这个问题，但我希望它有所帮助.您使用的正则表达式可能是您可能使用的最贪婪的表达式.它匹配所有内容，这包括图块定义本身(basicLayout.jsp、header.jsp、footer.jsp)中的所有内容.这解释了为什么当您的 REGEXP 切片定义不断匹配每个文件请求并尝试使用新模板调用(模板递归！)来满足每个新文件请求时，您会得到一个无限循环.
I haven't quite worked this out to my satisfaction but I hope it helps. The regular expression you are using is probably the greediest expression you could possibly use. It matches everything and this includes everything inside the tiles definition itself (basicLayout.jsp, header.jsp, footer.jsp). This explains why you are getting an infinite loop as your REGEXP tiles definition keeps matching every file request and attempting to satisfy each new file request with a new template invocation (template recursion!).
Tiles Wildcard 支持页面 显示了几个示例.这些示例都没有使用 (.*) - 我想我们刚刚弄清楚了为什么会这样.
The Tiles Wildcard support page shows several examples. None of these examples use (.*) - I think we have just worked out why this might be.
你需要让你的 REGEXP 稍微不那么贪婪；我知道 Struts 使用稍微不同的方法来调用模板图块，但假设您有一个 JSP 页面，其中包含:
You will need to make your REGEXP slightly less greedy; I know Struts uses a slightly different approach to invoke template tiles but imagine you have a JSP page containing:
<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %>
<tiles:insertDefinition name="somepage.tile" />
下面的图块定义应该创建您的模板页面，围绕来自 /WEB-INF/pages/somepage.jsp 的内容:
and the following tiles definition should create your template page wrapped around the content from /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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