我安装了JAVA版本10.但我无法运行与本机反应android因为android不支持java版本10.now我需要将我的java版本撤销到8我该怎么办呢.
我需要在自己的Java版本上进行切换，Mac OS X 10.8.4但不确定如何，我现在拥有的版本是，1.6.0_51但是我想切换到1.6.0_45：
$ java-版本 Java版本“ 1.6.0_51” Java（TM）SE运行时环境（内部版本1.6.0_51-b11-457-11M4509） Java HotSpot（TM）64位服务器VM（内部版本20.51-b01-457，混合模式） / usr / libexec / java_home -v 1.6.0_43 找不到与版本“ 1.6.0_43”匹配的JVM。 /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
我认为1.6.0_43我的Mac上没有这样的版本？如何安装然后切换到它？谢谢！
我正在尝试在新的Macbook中安装spark。我无法运行spark-shell并收到以下错误：
Failed to initialize compiler: object java.lang.Object in compiler mirror not found.
** Note that as of 2.8 scala does not assume use of the java classpath.
** For the old behavior pass -usejavacp to scala, or if using a Settings
** object programmatically, settings.usejavacp.value = true.
Exception in thread "main" java.lang.NullPointerException
at scala.reflect.internal.SymbolTable.exitingPhase(SymbolTable.scala:256)
at scala.tools.nsc.interpreter.IMain$Request.x$20$lzycompute(IMain.scala:896)
at scala.tools.nsc.interpreter.IMain$Request.x$20(IMain.scala:895)
at scala.tools.nsc.interpreter.IMain$Request.headerPreamble$lzycompute(IMain.scala:895)
at scala.tools.nsc.interpreter.IMain$Request.headerPreamble(IMain.scala:895)
at scala.tools.nsc.interpreter.IMain$Request$Wrapper.preamble(IMain.scala:918)
at scala.tools.nsc.interpreter.IMain$CodeAssembler$$anonfun$apply$23.apply(IMain.scala:1337)
at scala.tools.nsc.interpreter.IMain$CodeAssembler$$anonfun$apply$23.apply(IMain.scala:1336)
at scala.tools.nsc.util.package$.stringFromWriter(package.scala:64)
at scala.tools.nsc.interpreter.IMain$CodeAssembler$class.apply(IMain.scala:1336)
at scala.tools.nsc.interpreter.IMain$Request$Wrapper.apply(IMain.scala:908)
at scala.tools.nsc.interpreter.IMain$Request.compile$lzycompute(IMain.scala:1002)
at scala.tools.nsc.interpreter.IMain$Request.compile(IMain.scala:997)
at scala.tools.nsc.interpreter.IMain.compile(IMain.scala:579) …我正在为我的公司升级ElasticSearch.首先,我需要在我的机器上运行旧版本(1.1.2),该机器运行OSX Sierra(10.12.6).我elasticsearch@1.1.2已从我公司的存储库下载,但它没有正常启动.我明白了:
$ brew services list
Name Status User Plist
elasticsearch@1.1.2 started pjscopeland /Users/pjscopeland/Library/LaunchAgents/homebrew.mxcl.elasticsearch@1.1.2.plist
...但是Homebrew的状态" started"是黄色的,其余的都是绿色的,如果我手动运行它,我会得到这个:
$ elasticsearch
Java HotSpot(TM) 64-Bit Server VM warning: Option UseParNewGC was deprecated in version 9.0 and will likely be removed in a future release.
Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.elasticsearch.bootstrap.Bootstrap.main(Bootstrap.java:190)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:32)
Caused by: java.lang.UnsupportedOperationException: Boot class path …