小编che*_*ohi的帖子

运行jmap如下：

jmap -heap 5788

并得到失败的结果：

正在附加到进程 ID 5788，请稍候...附加到进程时出错：

sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.execute(BsdDebuggerLocal.java:169)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach(BsdDebuggerLocal.java:287)
    at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:671)
    at sun.jvm.hotspot.HotSpotAgent.setupDebuggerDarwin(HotSpotAgent.java:659)
    at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:341)
    at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:304)
    at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)
    at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
    at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
    at sun.jvm.hotspot.tools.JInfo.main(JInfo.java:138)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.tools.jinfo.JInfo.runTool(JInfo.java:108)
    at sun.tools.jinfo.JInfo.main(JInfo.java:76)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach0(Native Method)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.access$100(BsdDebuggerLocal.java:65)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$1AttachTask.doit(BsdDebuggerLocal.java:278)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.run(BsdDebuggerLocal.java:144)

我使用sbt 0.13.1创建了两个模块,并创建了project/MyBuild.scala来编译这两个模块. MyBuild.scala:

import sbt._
import Keys._
object MyBuild extends Build {
    lazy val task = project.in(file("task"))
    lazy val root = project.in(file(".")) aggregate(task) dependsOn task
}

当我通过设置scalaHome将scala库更改为2.11.2时.它会去maven下载task.jar并失败,这很奇怪.这是一个sbt bug吗？

有github测试项目地址:test-sbt-0.13.1

当我使用Binding.scala时，我想div根据源数据创建一些someCollection：

val someCollection = Seq("foo", "bar")
someCollection.map { item =>
  <div>{item.bind}</div>
}

但是，我遇到了编译器错误each instructions must be inside a SDE block。

我怎样才能解决这个问题？

当我尝试scala列表时,我发现了一个问题.当我使用MutableList时,只想尝试在foreach中追加一个元素(我知道这是一个糟糕的操作):

import scala.collection.mutable.MutableList
val tts = MutableList("Hello World~")
tts.foreach { t => 
  tts += "Hello World~"
  println(t)
}

控制台输出:

Hello World~
Hello World~

我的问题是为什么上面的代码没有抛出ConcurrentModificationException或输出正常？