Ubuntu 14.04上的Spark安装错误缺少javac？

我在我的Ubuntu14.04上安装了Spark，它似乎很顺利地运行了很长一段时间，然后用我之前安装并检查过的Scala进行了轰炸。。。请参见底部的Java详细信息

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
[error] (streaming-flume-sink/compile:compile) java.io.IOException: Cannot run program "/usr/lib/jvm/java-7-openjdk-amd64/bin/javac": error=2,    No such file or directory
[error] (unsafe/compile:compile) java.io.IOException: Cannot run program "/usr/lib/jvm/java-7-openjdk-amd64/bin/javac": error=2, No such file or directory
[error] (network-common/compile:compile) java.io.IOException: Cannot run program "/usr/lib/jvm/java-7-openjdk-amd64/bin/javac": error=2, No such file or directory
[error] (launcher/compile:compile) java.io.IOException: Cannot run program "/usr/lib/jvm/java-7-openjdk-amd64/bin/javac": error=2, No such file or directory
[error] Total time: 737 s, completed Nov 9, 2015 4:37:48 PM

我安装了Java：

tom@tom-sam:~$ java -version
java version "1.7.0_85"
OpenJDK Runtime Environment (IcedTea 2.6.1) (7u85-2.6.1-5ubuntu0.14.04.1)
OpenJDK 64-Bit Server VM (build 24.85-b03, mixed mode)

tom@tom-sam:~$ java -version
java version "1.7.0_85"
OpenJDK Runtime Environment (IcedTea 2.6.1) (7u85-2.6.1-5ubuntu0.14.04.1)
OpenJDK 64-Bit Server VM (build 24.85-b03, mixed mode)

有什么想法吗

我安装了Java：

tom@tom-sam:~$ java -version
java version "1.7.0_85"
OpenJDK Runtime Environment (IcedTea 2.6.1) (7u85-2.6.1-5ubuntu0.14.04.1)
OpenJDK 64-Bit Server VM (build 24.85-b03, mixed mode)

tom@tom-sam:~$ java -version
java version "1.7.0_85"
OpenJDK Runtime Environment (IcedTea 2.6.1) (7u85-2.6.1-5ubuntu0.14.04.1)
OpenJDK 64-Bit Server VM (build 24.85-b03, mixed mode)

您已经安装了java运行时（JRE）。您需要JDK（Java开发者工具包）。您可以安装或。对于OpenJDK，它应该像

$ sudo apt-get install default-jdk

对于OracleJDK来说，它只涉及到一点

$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update

然后是其中一个

$ sudo apt-get install oracle-java6-installer

或

或

---

分别适用于Java 6、7或8。

您确定bin文件夹

/usr/lib/jvm/Java-7-openjdk-amd64/bin/

中存在Java位吗？