小编Kri*_*kar的帖子

我有一个Set实例:

Set<String> siteIdSet = (Set<String>) pContext.getParent().getPropertyValue(getCatalogProperties().getSitesPropertyName());

这pContext.getParent().getPropertyValue()是开箱即用的代码,我无法修改任何控件.

需求:

我想从中获取第一个默认元素(总是).但是,我找不到get(index)类似的方法ArrayList.

因此,现在,我这样做.

for (Iterator<String> it = siteIdSet.iterator(); it.hasNext();) {
    siteId = it.next();
    break;
}

有没有(其他)有效的方法(简短和更好)实现这一目标？

我正在使用Maven站点:运行以生成cobertura代码覆盖...

以下是我对cobertura的pom.xml配置:

<reporting>
    ...
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>cobertura-maven-plugin</artifactId>
            <version>2.3</version>
        </plugin>
    </plugins>
</reporting>

但是我在网站的末尾得到OutOfMemoryError:运行.请建议如何摆脱这个错误.(我已经尝试了所有这些-Xmx,-XX选项...)

Exception in thread "Thread-0" java.lang.OutOfMemoryError: Java heap space
        at sun.reflect.GeneratedSerializationConstructorAccessor74.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at java.io.ObjectStreamClass.newInstance(ObjectStreamClass.java:924)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1737)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at java.util.HashMap.readObject(HashMap.java:1030)
        at sun.reflect.GeneratedMethodAccessor347.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:480)
        at net.sourceforge.cobertura.coveragedata.CoverageDataContainer.readObject(CoverageDataContainer.java:373)
        at sun.reflect.GeneratedMethodAccessor348.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at java.util.HashMap.readObject(HashMap.java:1030)
        at sun.reflect.GeneratedMethodAccessor347.invoke(Unknown Source)
        at …

DCEVM的主站点没有清楚地解释如何在Linux上安装DCEVM.在Linux中运行"java -jar installer.jar"(通过PuTTy访问)给了我以下异常.

[admin@LINUXBOX jdk1.7.0_55]$ java -jar DCEVM-full-7u79-installer.jar
java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:207)
at java.awt.Window.<init>(Window.java:535)
at java.awt.Frame.<init>(Frame.java:420)
at javax.swing.JFrame.<init>(JFrame.java:224)
at com.github.dcevm.installer.MainWindow.<init>(MainWindow.java:43)
at com.github.dcevm.installer.Main.main(Main.java:46)
Exception in thread "main" java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:207)
at java.awt.Window.<init>(Window.java:535)
at java.awt.Frame.<init>(Frame.java:420)
at java.awt.Frame.<init>(Frame.java:385)
at javax.swing.SwingUtilities$SharedOwnerFrame.<init>(SwingUtilities.java:1757)
at javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:1832)
at javax.swing.JOptionPane.getRootFrame(JOptionPane.java:1697)
at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:863)
at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:667)
at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:638)
at com.github.dcevm.installer.Main.main(Main.java:51)

如果需要,我也准备使用Virtual …

是否有任何有效的开源替代方案可用于New Relic为Java平台(特别是用于监测J2EE应用服务器一样 JBoss)？

使用xpath选择后使用正则表达式匹配某些文本

例如 Huntsville, Alabama 11111

我只希望Alabama它总是以逗号后出现,我用逗号[^,]*$来获取文本,但我似乎无法找到排除数字的方法或只返回字母

另一个例子,当我想在我使用的逗号之后得到数字[^[0-9],]*$ 但是当我试图用其他任何东西调整它时它只返回数字或什么也没有.