A Linux administrator is running a script that runs a Java application but receives the following error: Error: Java_Home is not set Java is installed on the Linux server and java -version returns a v

Exporting PATH=$PATH:$JAVA_HOME appends JAVA_HOME to the existing PATH but does not define or assign a value to JAVA_HOME itself, so the original error would remain.

Using 'echo `which java` > $JAVA_HOME' redirects the java path string into a file whose name is the current (unset) value of $JAVA_HOME rather than assigning that path as the variable's value.

'Export Java_Home which java' is invalid shell syntax because it omits the assignment operator and command substitution required to set the variable to the output of the 'which java' command.

The form 'set JAVA_HOME=`which java`' uses command substitution to capture the path returned by 'which java' and assign it to JAVA_HOME before the Java application starts. Because java is confirmed installed and 'java -version' succeeds, 'which java' returns a valid path, satisfying the 'JAVA_HOME is not set' requirement at the script level. This approach resolves the error without requiring a persistent system-wide environment change outside the script.