我们正在逐步用 Spring-MVC 和 Spring-Webflow 替换 Seam 组件。
运行 JMeter 测试日志在几个小时后变得杂乱无章,出现 StackOverFlowErrors:
javax.servlet.ServletException: Servlet execution threw an exception
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:313)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:341)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:530)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
...
Caused by: java.lang.StackOverflowError
at org.jboss.seam.jsf.SeamApplication.getMessageBundle(SeamApplication.java:264)
at org.springframework.faces.webflow.FlowApplication.getMessageBundle(FlowApplication.java:214)
at org.jboss.seam.jsf.SeamApplication.getMessageBundle(SeamApplication.java:264)
at org.springframework.faces.webflow.FlowApplication.getMessageBundle(FlowApplication.java:214)
at org.jboss.seam.jsf.SeamApplication.getMessageBundle(SeamApplication.java:264)
at org.springframework.faces.webflow.FlowApplication.getMessageBundle(FlowApplication.java:214)
at org.jboss.seam.jsf.SeamApplication.getMessageBundle(SeamApplication.java:264)
所以 getMessageBundle 方法被两个实例调用:SeamApplication 和 FlowApplication。
查看 javax.faces.application.Application 类,它说:
“因为这个实例是共享的,所以必须以线程安全的方式实现。”
也许这两个应用程序实例正在尝试访问导致竞争条件的同一个包?
编辑: 在应用程序不再响应后,我们重新启动了服务器,现在错误出现在另一个地方:
Caused by: java.lang.StackOverflowError
at org.jboss.seam.contexts.BasicContext.get(BasicContext.java:49)
at org.jboss.seam.contexts.BasicContext.get(BasicContext.java:44)
at org.jboss.seam.core.Init.instance(Init.java:117)
at org.jboss.seam.jsf.SeamApplication$ConverterLocator.<init>(SeamApplication.java:140)
at org.jboss.seam.jsf.SeamApplication.createConverter(SeamApplication.java:122)
at org.springframework.faces.webflow.FlowApplication.createConverter(FlowApplication.java:161)
at org.jboss.seam.jsf.SeamApplication.createConverter(SeamApplication.java:126)
at org.springframework.faces.webflow.FlowApplication.createConverter(FlowApplication.java:161)
at org.jboss.seam.jsf.SeamApplication.createConverter(SeamApplication.java:126)
最后两行在日志文件中重复了数千次。
我们正在使用以下组件版本:
JSF-1.2
Seam-2.2.0
Spring WebFlow 2.3.4
Spring MVC 3.0.5
更新任何组件都不是一种选择。
最佳答案
SeamApplication
和 FlowApplication
在正确委派给包装的应用程序方面存在错误。修复它的一种方法是通过 FlowApplicationFactory
.
首先捕获它的raw source code并将其放入 webapp 项目的 Java 源文件夹中,保留其原始包。您不一定需要操作 JAR。 /WEB-INF/classes
中的类(class)比 JAR 中的类加载优先级更高。
然后按如下方式操作类(基于 OmniFaces OmniApplicationFactory
):
public class FlowApplicationFactory extends ApplicationFactory {
private final ApplicationFactory wrapped;
private volatile Application application;
public FlowApplicationFactory(ApplicationFactory wrapped) {
this.wrapped = wrapped;
}
@Override
public Application getApplication() {
return (application == null) ? createFlowApplication(wrapped.getApplication()) : application;
}
@Override
public synchronized void setApplication(Application application) {
wrapped.setApplication(createFlowApplication(application));
}
private Application createFlowApplication(final Application application) {
Application newApplication = application;
while (!(newApplication instanceof FlowApplication) && newApplication instanceof SeamApplication) {
newApplication = ((SeamApplication) application).getDelegate();
}
if (!(newApplication instanceof FlowApplication)) {
newApplication = new FlowApplication(application);
}
return (this.application = newApplication);
}
}
因此,在创建 FlowApplication
时,它将首先检查包装的应用程序(如果之前尚未创建),如果已创建,则重新使用它。
请注意 SeamApplication
依赖很尴尬,但这只是为了修复它。 JSF2 通过新的 ApplicationWrapper
使它变得更容易您可以使用的类而不是 SeamApplication
在createFlowApplication()
block 。
如果这一切仍然不起作用,那么可能是 SeamApplicationFactory
在 FlowApplicationFactory
之后 初始化.您可以通过显式重新声明 <application-factory>
来强制排序webapp 自己的条目 faces-config.xml
按所需顺序(修复错误的作为最后一个):
<factory>
<application-factory>org.jboss.seam.jsf.SeamApplicationFactory</application-factory>
<application-factory>org.springframework.faces.webflow.FlowApplicationFactory</application-factory>
</factory>
否则,您可能希望对 SeamApplicationFactory
执行与上述相同的操作(显然在代码中交换了 FlowApplication
和 SeamApplication
)。
关于jsf - Seam/Spring WebFlow 应用程序中的 StackOverflowError,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25330662/