The issue of switching openjdk to Oracle JDK in CentOS will cause Tomcat to not start properly

Set the JDK environment variable, and the command line uses java-version

Use the service tomcat-web1 Start command to report the following error
Neither the Java_home nor the JRE_HOME environment variable is defined. At least one of these environment variable are needed to run this program

Note: TOMCAT-WEB1 is the Tomcat service name, Tomcat set up the service method online there are many no longer repeat

One way is to modify the setclasspath.sh, adding at the beginning of the SH script
java_home=/usr/lib/java-1.7.0
But this method is not good, if the Java home changes also need to modify the shell

So in a different way, look at the shell script first.

catalina_home_data=/usr/local/tomcat/tomcat7.< Span class= "Hljs-number" >0  start_tomcat= $CATALINA _home_data /bin/ Startup.shstop_tomcat= $CATALINA _home_data /bin/shutdown.sh start   () {${start_tomcat}  if  [$? -eq  0 ];        then  printf      "Tomcat7-data started \t\t\t\t\t[\033[32m ok \033[m]\n" ;        else  printf      "Tomcat7-data started \t\t\t\t\t[\033[31m FAIL \033[m]\n" ; fi }  

The

service runs the specified services (known as the System V initial script), removing most of the environment variables, preserving only the Lang and term environment variables, and setting the current path to/, that is, running the service script in a very clean environment that can be predicted.
The environment variable cannot be found while the script is running, so modify it to the following script

catalina_home_data=/usr/local/tomcat/tomcat7. 0  start_tomcat= $CATALINA _home_data /bin/ Startup.shstop_tomcat= $CATALINA _home_data /bin/shutdown.sh start   () {su-root-c  "${start_tomcat} "  if  [$?] -eq  0 ]; then  printf   "Tomcat7-data started \t\t\t\t\t[\033[32m ok \033[m]\n" ; else  printf   "Tomcat7-data started \t\t\t\t\t[\033[31m FAIL \033[m]\n" ; fi } 

Su-root-c "${start_tomcat}"
-Represents the execution environment variable
-C is the Execute command
The overall command means to execute the/usr/local/tomcat/tomcat7.0/bin/startup.sh command in the same way as the root user and with environment variables

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The issue of switching openjdk to Oracle JDK in CentOS will cause Tomcat to not start properly