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So i can simplify like below:

type -a: Return not found when symlink broken or non-executable.

So what i can advise is install the jdk again, which "oracle jdk" is prefer over than "openjdk".

The version number of 8u91 version above is keep updating, so you should always visits oracle websites to find out the latest version. Click the JDK DOWNLOAD button will go to this page which shows the latest version number and its correct filename.

You can also download the docs which the real link can be found here page, and unzip it (Assume your jdk has been installed at /usr/java/jdk1.8.0_91/):

Then use this two commands to choose the correct javac and java, i believe you only have one option (This sample shows jdk1.8.0_74 due to mine is not the latest 8u91):

So, I can simplify like below:

type -a: Return not found when symlink is broken or non-executable.

So, what I can advise is install the JDK again, which "Oracle JDK" is preferred over than "OpenJDK".

The version number of 8u91 version above is keep updating, so you should always visits Oracle websites to find out the latest version. Click the JDK DOWNLOAD button will go to this page which shows the latest version number and its correct filename.

You can also download the docs which the real link can be found here page, and unzip it (Assume your JDK has been installed at /usr/java/jdk1.8.0_91/):

Then use this two commands to choose the correct javac and java. I believe you only have one option (This sample shows jdk1.8.0_74 due to mine is not the latest 8u91):

So what i can advise is install the jdk again, which "oracle jdk" is prefer over than "openjdk".

So what i can advise is install the jdk again, which "oracle jdk" is prefer over than "openjdk".

So what i can advise is install the jdk again, which "oracle jdk" is prefer over than "openjdk".

All of them will return not found if the input file doesn't exist.

So what i can advise is install the jdk again, which "oracle jdk" is prefer over than "openjdk".