我正在使用创建会话
HttpSession session = request.getSession();
在创建会话之前,我想检查它是否存在.我该怎么做？
我需要知道如何为IntelliJ IDEA 10.04配置C++ SDK的路径.我安装了C/C++插件,但是我不知道C++ SDK的正确路径是什么.
我正在使用ubuntu 11.04.
我试图在性能方面InputStream.read()与vs 进行比较InputStream.read(byte[] b).
被InputStream.read(byte[] b)以某种方式更快,给出的read(b, off, len)类方法InputStream简单地调用该方法read()反复？
这是一个完整的测试用例:
<!DOCTYPE html>
<html>
<head>
<title>test</title>
<style type="text/css">
html, body, ul, li, div, span {
padding: 0;
margin: 0;
}
ul.container {
display: table;
list-style-type: none;
margin-right: 24px;
position: relative;
}
ul.container li {
display: table-cell;
position: relative;
}
ul.container div, ul.container span {
border: 1px dotted #000;
}
ul.container div {
width: 40px;
height: 40px;
position: absolute;
left: 0;
top: 40px;
background-color: #008000;
}
ul.container span {
display: block;
width: 40px;
height: 40px;
background-color: #9acd32;
}
</style>
</head>
<body> …在运行使用声纳分析源代码时我得到的是PicoLifecycleException以下是stacktrace,
org.picocontainer.PicoLifecycleException: PicoLifecycleException: method 'public void org.sonar.batch.components.EmbedderPhases.start()', instance 'org.sonar.batch.components.EmbedderPhases@1f4e9be, java.lang.RuntimeException: wrapper
at org.picocontainer.monitors.NullComponentMonitor.lifecycleInvocationFailed(NullComponentMonitor.java:77)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.monitorAndThrowReflectionLifecycleException(ReflectionLifecycleStrategy.java:132)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.invokeMethod(ReflectionLifecycleStrategy.java:115)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.start(ReflectionLifecycleStrategy.java:89)
at org.picocontainer.injectors.AbstractInjectionFactory$LifecycleAdapter.start(AbstractInjectionFactory.java:84)
at org.picocontainer.behaviors.AbstractBehavior.start(AbstractBehavior.java:169)
at org.picocontainer.behaviors.Stored$RealComponentLifecycle.start(Stored.java:132)
at org.picocontainer.behaviors.Stored.start(Stored.java:110)
at org.picocontainer.DefaultPicoContainer.potentiallyStartAdapter(DefaultPicoContainer.java:996)
at org.picocontainer.DefaultPicoContainer.startAdapters(DefaultPicoContainer.java:989)
at org.picocontainer.DefaultPicoContainer.start(DefaultPicoContainer.java:746)
at org.sonar.batch.Module.start(Module.java:88)
at org.sonar.batch.SonarEclipseRuntime.analyse(SonarEclipseRuntime.java:44)
at org.sonar.ide.eclipse.core.jobs.AnalyseProjectJob.run(AnalyseProjectJob.java:107)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.lang.RuntimeException: wrapper
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.monitorAndThrowReflectionLifecycleException(ReflectionLifecycleStrategy.java:130)
... 13 more
Caused by: org.sonar.api.utils.SonarException: Can not execute Checkstyle
at org.sonar.plugins.checkstyle.CheckstyleExecutor.execute(CheckstyleExecutor.java:87)
at org.sonar.plugins.checkstyle.CheckstyleSensor.analyse(CheckstyleSensor.java:43)
at org.sonar.batch.phases.SensorsExecutor.execute(SensorsExecutor.java:58)
at org.sonar.batch.components.EmbedderPhases.start(EmbedderPhases.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.invokeMethod(ReflectionLifecycleStrategy.java:110)
... …我正在玩分布式Erlang.这是一个非常有趣的,但我想稍微揭示一下魔法,看看Erlang节点之间实际发送了什么.
你能否建议任何Erlang模块或外部工具？
先感谢您!
更新:
BTW,Debian用户可以使用安装Wireshark sudo apt-get install wireshark
我有这个疑问,什么参数控制JSESSIONID的超时？特别考虑这个用例:我有一个移动客户端,它使用JSESSIONID标头发送cookie,但是客户端与应用程序交互并将其留在后台大约6个小时......存储在客户端的cookie不是'删除,然后再次发送回服务器...... JSESSIONID仍然有效吗？哪些参数或配置决定了服务器上cookie的超时？非常感谢.
我想将 Spring Security 属性加载到变量中。
变量：
edit提供的布尔值POST（加载工作正常）isSupervisor如果用户具有主管角色，则布尔值应该为真（我不知道如何将其加载到可访问的变量中。我尝试了许多不同的方法，但没有奏效。）代码：
//set somehow the isSupervisor variable
//var isSupervisor = hasRole('ROLE_SUPERVISOR')
<c:if test="${edit} and not isSupervisor">
... do something
</c:if>