错误：无法找到或加载 javac 的主类

Question

在这里尝试跟随：https://docs.oracle.com/javase/tutorial/getStarted/intro/index.html

我无法获得在 Java 中执行第 1 步的咒语。

我已尝试导出 CLASSPATH=。并导出 CLASSPATH= 但我什至还没有类文件。

有人能指出正确的方向吗？已经尝试了大部分基本帖子。

$uname -a
Linux box  3.19.0-41-generic #46-Ubuntu SMP Fri Dec 4 18:18:11 UTC     2015 x86_64 x86_64 x86_64 GNU/Linux

$ javac -version
java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)

$javac ./hello.java 
Error: Could not find or load main class ..hello.java
$javac ./hello
Error: Could not find or load main class ..hello
$javac hello.java 
Error: Could not find or load main class hello.java
$javac hello
Error: Could not find or load main class hello
$javac -cp .  hello
Error: Could not find or load main class hello
$javac -d  .  hello
Unrecognized option: -d
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
$java -version 
java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)

$ cat hello.java 
public class hello

{
    public static void main(String[] args) 
    {
        System.out.println("Hello World!"); 
    }
}

Answer 1

注意：javac 已链接到 java。

解决方案：

rm /etc/alternatives/javac
ln -s /usr/local/java/jdk1.8.0_77/bin/javac /etc/alternatives/javac