小编Sta*_*lin的帖子

我用下一个方式描述我的面板

<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">
<ui:UiBinder xmlns:ui='urn:ui:com.google.gwt.uibinder'
         xmlns:g='urn:import:com.google.gwt.user.client.ui'>
<g:DockLayoutPanel unit="PX" width="600" >
    <g:north size="85">
    ....
    </g:north>
    <g:center>
    ....

    </g:center>
</g:DockLayoutPanel>

为北部和中间下一个div生成GWT.

 <div style="position: absolute; overflow: hidden; left: 0px; top: 0px; right: 0px; height: 85px;"
 <div style="position: absolute; overflow: hidden; left: 0px; top: 85px; right: 0px; bottom: 0px;">

它们包含我需要的数据,但第二个div没有显示.哪里错了？

UPD: 仅举例来说

    <g:center>
        <g:FlowPanel height="100%">
            <g:Label height="100%">TEST2</g:Label>
        </g:FlowPanel>
    </g:center>

我明白了

<div style="position: absolute; overflow: hidden; left: 0px; top: 85px; right: 0px; bottom: 0px;">
<div style="position: absolute; overflow: hidden; left: 0px; top: 85px; …

我正在尝试将spring与hibernate集成,但是捕获NamingException:Context是只读的

堆栈跟踪

WARNING: Could not bind factory to JNDI
javax.naming.NamingException: Context is read only
    at org.apache.naming.NamingContext.checkWritable(NamingContext.java:903)
    at org.apache.naming.NamingContext.createSubcontext(NamingContext.java:517)
    at org.apache.naming.NamingContext.createSubcontext(NamingContext.java:538)
    at org.apache.naming.SelectorContext.createSubcontext(SelectorContext.java:422)
    at javax.naming.InitialContext.createSubcontext(InitialContext.java:464)
    at org.hibernate.util.NamingHelper.bind(NamingHelper.java:69)
    at org.hibernate.impl.SessionFactoryObjectFactory.addInstance(SessionFactoryObjectFactory.java:90)
    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:306)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:855)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:774)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1460)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1398)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:512)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:540)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:842)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:416)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:261)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:192)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4350)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:626)
    at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:553) …

我有一个单一原子操作的方法,就像这个

int value;

public void setValue(int value) {
    this.value = value;
}

然后我以明显的方式称呼它,比如

foo.setValue(10);

问题是:它是原子操作吗？如果不是,将执行哪些原子操作？我如何在我的电脑上测试这个(如果可以的话)？

为什么这个"代码"失败了

<g:DockPanel unit="px">
    <g:south size="100">
        <g:TextBox ui:field="host" text="localhost"/>
    </g:south>
    <g:south size="100">
        <g:TextBox ui:field="port" text="3287"/>
    </g:south>
</g:DockPanel>

而这个

<g:HorizontalPanel>
    <g:cell>
        <g:TextBox ui:field="host" text="localhost"/>
    </g:cell>
    <g:cell>
        <g:TextBox ui:field="port" text="3287"/>
    </g:cell>
</g:HorizontalPanel>

不？

附加信息:

堆栈跟踪

ERROR: Deferred binding failed for 'client.view.EnterPage.EnterPageUiBinder'; expect subsequent failures. 
ERROR: Unable to load module entry point class client.Dbweb (see associated exception for details). java.lang.RuntimeException: Deferred binding failed for 'client.view.EnterPage$EnterPageUiBinder' (did you forget to inherit a required module?)
    at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:53)
    at com.google.gwt.core.client.GWT.create(GWT.java:98)
    at client.view.EnterPage.<clinit>(EnterPage.java:27)
    at client.Dbweb.onModuleLoad(Dbweb.java:15)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) …

我的模型中有一些事件和一些处理逻辑.我想组织沟通逻辑抛出Actors.但是如何act()在不指定每个具体类的情况下继承处理逻辑

简化示例

class Event {}

case class FooEvent(str : String) extends Event
case class BarEvent(i : java.lang.Integer) extends Event

trait FooListener extends Actor {
  def act() {
    react{
      case FooEvent => print("foo received")
    }
  }
}
trait BarListener extends Actor {
  def act() {
    react{
      case BarEvent => print("bar received")
    }
  }
}
class ListensOnlyBar extends BarListener{}

//can't be done: 
//error: overriding method act in trait FooListener of type ()Unit;
//method act in trait BarListener of type ()Unit …

是否有任何库提供用于模拟具有特征的类的工具(两者都可以是有状态的)？

简化示例:

trait T {
  var xx: List[Int] = List[Int]()
  def t(x: Int) {
    xx ::= x    //throws NPE, xx == null, even after implicit initialization
  }
}

class A extends T {
}

class Testable(a: A) {
  def bar() {
    a.t(2)
  }
}

@Test def testFoo() {
  val a: A = mock[A]
  val testable = new Testable(a)
  testable.bar()
  verify(a).t(2)
}

我有一个记录 (defrecord Rec [id])

我喜欢它

(def my ( Rec. 2 ))
(println (:id my))

现在我想用宏替换记录def.所以我可以写

(r 2) 
(println (:id my))

我写了宏

(defmacro r [id]
   (list 'def 'my (symbol "(") 'Rec. id (symbol ")")))

我用macroexpand检查了它

(macroexpand-1 '(r 2))  => (def my ( Rec. 2 ))

但我得到RuntimeException: Too many arguments to def的(r 2).

当有人点击它时,我想让我的文本字段清除文本.我怎样才能做到这一点？

我有一些带有一些预定义功能和记录的clojure文件

;outer.clj
(ns outer )
(defn foo [a] (println a))
(defrecord M [id])

现在用法文件

;inner.clj
(ns inner (:use outer ))
(foo 2)    ;works fine
(println (:id (M. 4))) ;throws IllegalArgumentException: Unable to resolve classname: M

为什么函数导入正常但记录定义没有？我应该如何进口呢？

如何匹配变量值。所以，我想像这样写 smt

 val x = 2
 val m = (1, 2)
 case m of (_, valueOf(x)) => "same" 
         | (_, _)          => "different"

我猜，它命名为稳定标识符。