common errors in java

Common Java Errors

1. After configuring Java environment variables, you still cannot use java Order.

Solution:

If this problem occurs on Windows 10 system, it is because some Windows 10 systems do not recognize the "JAVA_HOME" environment variable and change path Change all "%JAVA_HOME%" to the real folder path of the JDK. The environment variables are configured incorrectly. Carefully check whether the JDK folder address is correct. JDK failed to install properly, please reinstall.

2. The correct Java code cannot be run on the console

Java files can be compiled through the javac command, but cannot be run using the java command.

Solution:

If you are using a Windows 10 system, it may be caused by the system security permissions being too high and not allowing the Java virtual machine to operate the C drive. You can put the java file in another drive letter and run it.

The command to enter other drive letters is as follows: (for example, enter the D drive)

3. When generating the document, a javadoc error occurs - Unable Read Input length = 1

Solution:

You may not have selected any outputable Java files in the steps. This problem may be caused by the new version of eclipse itself. Don't worry about this function. This is not a Java technology, it is just a function provided by eclipse. You can continue to learn it later.

4. The 32-bit JDK cannot be found

On the official website, there is only JDK9, but JDK9 only has 64-bit installation packages, not 32-bit ones. What should I do?

Solution:

In the main download page, scroll down and you will see the JDK8 version . JDK8 has a 32-bit installation package.

If you want to download a lower version of JDK, scroll to the bottom of the webpage, find the "Java Archive" label, and click download on the right.

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