小编Sam*_*Sam的帖子

JRuby 1.6.x. 如何将浮点数舍入到jruby中的小数位数.

number = 1.1164
number.round(2)

The above shows the following error
wrong number of arguments (1 for 0)

如何将其舍入到2位小数？

如何在一行中的单词之间搜索多个空格的出现次数

1. this is a line containing  2 spaces
2. this is a line containing   3 spaces
3. this is a line containing multiple spaces first  second   three   four

以上所有都是此正则表达式的有效匹配.我应该使用什么正则表达式？

我想通过eclipse搜索以下两行的多个文件:

@Length(max = L_255)
private String description;

并用这两个替换它们:

@Length(max = L_255, message="{validator.description.len}")
private String description;

我正在寻找可以在J2EE应用程序中读取RSS/ATOM源的库(基于JBoss Seam).

是罗马有阅读饲料唯一的应用程序？

我假设Seam RSS 集成仅用于生成RSS源而不用于读取源.

将enabled变量声明为布尔值或布尔值是否有区别？从内存占用的角度来看,这是更可取的.

@Entity
class User {

     @Column
     Boolean enabled;
}

我想为git命令使用快捷方式或别名.

git diff
git status
git push 
git pull
git stash
git branch -a

如何创建快捷方式或别名,是否有预定义的列表？

是否有任何工具可以自动通知您从公共maven存储库中添加的任何新插件(例如Apache | Codehaus | JBoss | Sourceforge maven存储库......)

我得到了这个错误,即使我的模型类中没有验证约束(所有成员变量都设置正确但我仍然在创建对象时获得此异常).如何调试此错误？

javax.el.ELException: org.hibernate.validator.InvalidStateException: valida
tion failed for: com.mycompany.model.User
        at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.jav
a:339)
        at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.jav
a:280)
        at org.jboss.el.parser.AstMethodSuffix.getValue(AstMethodSuffix.jav
a:59)
        at org.jboss.el.parser.AstMethodSuffix.invoke(AstMethodSuffix.java:
65)
        at org.jboss.el.parser.AstValue.invoke(AstValue.java:96)
        at org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.ja
va:276)
        at org.jboss.seam.core.Expressions$2.invoke(Expressions.java:175)
        at org.jboss.seam.navigation.Pages.callAction(Pages.java:703)
        at org.jboss.seam.navigation.Pages.preRender(Pages.java:331)
        at org.jboss.seam.jsf.SeamPhaseListener.preRenderPage(SeamPhaseList
ener.java:561)
        at org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPh
aseListener.java:472)
        at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhas
eListener.java:148)
        at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListen
er.java:118)
        at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:214)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:96)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:
139)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(Applica
tionFilterChain.java:206)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamF
ilter.java:83)
        at org.jboss.seam.web.RewriteFilter.doFilter(RewriteFilter.java:63)

        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamF
ilter.java:69)
        at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:4
0)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamF
ilter.java:69)
        at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java
:90)
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamF
ilter.java:69)
        at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java …

如何在我的Gemfile中启用详细标志,以便我可以在构建本机扩展时准确跟踪发生的情况.因为它通常需要很长时间才能安装.

gem install libv8
Fetching: libv8-3.11.8.11.gem (100%)
Building native extensions.  This could take a while...

我们的rails3应用程序与作为REST函数公开的另一个rails应用程序对话 在对REST服务进行的所有POST调用中,迁移到rails3后会收到以下警告.

WARNING: Can't verify CSRF token authenticity

当我们对REST服务进行POST调用时,我们应该如何在线路上传递csrf令牌,ApplicationController具有protect_from_forgery方法,并且该调用也落在handle_unverified_request调用上.我们使用HTTP basic auth进行身份验证,它似乎工作正常.我们该怎么做才能解决这个问题.