Attempt to split long or double on the stack
我对这个错误的起源无知,不知道如何调试它.这表示什么样的问题？我该怎么解决？
[ERROR] [Mon May 23 14:29:46 IST 2011] [(class: org/apache/jsp/dashboard_jsp,method: _jspService signature: (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V) Attempt to split long or double on the stack] [10.97.34.222] hddlntdsz2350 [ session not set ] java.lang.VerifyError: (class: org/apache/jsp/dashboard_jsp,method: _jspService signature: (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V) Attempt to split long or double on the stack at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) at java.lang.Class.getConstructor0(Class.java:2699) at java.lang.Class.newInstance0(Class.java:326) at java.lang.Class.newInstance(Class.java:308) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:273)
问题编号：
我创建了一个如下所示的模型
public class Dashboardviewmodel implements Serializable { /** defalut serialization id */ private static final long serialVersionUID = 1L; /** * Collection representing all the services */ private Map<Long,ServiceCustomerModel> serviceDataMap;
}
在特定的JSP页面上,我正在执行以下操作.
for (Long serviceId : dashboardviewmodel.getServices()) { Service service = dashboardviewmodel.getService(serviceId); }
上述目标类中的getServices方法如下.
public Set<Long> getServices() {
return this.serviceDataMap.keySet();
}
进一步调查：
我已经使用以下代码片段更新了dashboard.jsp文件.我无法识别为什么,但这段代码正在运行.
ArrayList<Long> test = new ArrayList<Long>(); test.addAll(dashboardviewmodel.getServices()); for (long serviceId : test) { Service service = dashboardviewmodel.getService(serviceId); }
这个代码对数据有什么不同吗？
解决方法
A value of type long or type double
occupies two consecutive local
variables. Such a value may only be
addressed using the lesser index. For
example,a value of type double stored
in the local variable array at index n
actually occupies the local variables
with indices n and n +1; however,the
local variable at index n +1 cannot be
loaded from. It can be stored into.
However,doing so invalidates the
contents of local variable n.
当验证者确定使用不正确的指令来访问长整型或双变量(例如,尝试将索引n处的局部变量视为整数或浮点数,分割双倍/长期变量的指令时)那么所述错误被标记.
在这种情况下可以做很多事情,除了修复生成这个字节码的字节码生成器.这可能是Java编译器本身,或任何像ASM,cglib或Javassist这样的字节码操作框架.
编辑：
查看堆栈跟踪后,似乎有问题的类恰好是生成的servlet(来自dashboard.jsp).检查JDK涉及编译JSP的升级是否会解决问题,这是值得的.
