在OS X上使用Java 7和neo4j

Question

在系统首选项中将Java升级到7u45之后,Neo4j仍然警告我使用了错误的版本:

WARNING! You are using an unsupported Java runtime. Please use Oracle(R) Java(TM) Runtime Environment 7.

我想使用neo4j v2,它不支持Java 6,所以我需要解决这个问题.

Answer 1

我启动了一个neo4j 1.9.4服务器,并运行neo4j info.输出包括这一行:

JAVA_HOME:         /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

显然,我需要设置JAVA_HOME.怎么设置它？/usr/libexec/java_home返回同一目录.JavaVirtualMachines目录不包含任何其他子文件夹.所以我尝试了探索java控制面板(从系统首选项访问).在"Java"选项卡下,单击"查看",并给出7u45的路径:

/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java

所以我尝试了这个,猜测Contents/Home目录是同构的:

$ export JAVA_HOME=/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
$ neo4j start
WARNING! You are using an unsupported Java runtime. Please use Oracle(R) Java(TM) Runtime Environment 7.
Using additional JVM arguments:  -server -XX:+DisableExplicitGC -Dorg.neo4j.server.properties=conf/neo4j-server.properties -Djava.util.logging.config.file=conf/logging.properties -Dlog4j.configuration=file:conf/log4j.properties -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -Dneo4j.ext.udc.source=homebrew
Starting Neo4j Server...WARNING: not changing user
process [34808]... waiting for server to be ready. Failed to start within 120 seconds.
Neo4j Server may have failed to start, please check the logs.

那不好.

我搜索并找到了这篇文章,并根据我编辑的Lasse的建议/usr/local/Cellar/neo4j/1.9.4/libexec/bin/utils.我添加了两行:

 # check if running Oracle JDK 7, warn if not
 checkjvmcompatibility() {
+  echo $JAVACMD
+  $JAVACMD -version
   $JAVACMD -version 2>&1 | egrep -q "Java HotSpot\\(TM\\) (64-Bit Server|Server|C
 lient) VM"
   if [ $? -eq 1 ]
   then
     echo "WARNING! You are using an unsupported Java runtime. Please use Oracle(R) Java(TM) Runtime Environment 7."
   else
     $JAVACMD -version 2>&1 | egrep -q "java version \"1.7"
     if [ $? -eq 1 ]
     then
       echo "WARNING! You are using an unsupported version of the Java runtime. Please use Oracle(R) Java(TM) Runtime Environment 7."
     fi
   fi
 }

并再次尝试:

$ neo4j start
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java
bin/utils: line 349: /Library/Internet: No such file or directory
WARNING! You are using an unsupported Java runtime. Please use Oracle(R) Java(TM) Runtime Environment 7.

看起来路径中的空间令人困惑.我试图逃避它,但我的第一种方法失败了:

$ export JAVA_HOME="'/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home'"
$ neo4j start
Error: JAVA_HOME is not defined correctly.
  We cannot execute '/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home'/bin/java

然后我决定简单(不一定很好)的解决方案只是制作一个符号链接:

$ cd /Library/
$ sudo ln -s Internet\ Plug-Ins/ Internet-Plug-Ins
$ export JAVA_HOME=/Library/Internet-Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

此时neo4j start运行正常; 我设法升级到v2.0.0-M6,它仍然有效.