问题
I installed tomcat and Apache http-servers like two weeks ago. I got it running and I was able to run the JSP-pages from another computers. I had a little pause and now that I'm trying to run the system it doesn't work. I can access the default index-page in the
http://[my-IP-address]:8080
but cannot access the jsp folder's pages, not even .html files. It gives me
503 service temporarily unavailable.
Not even the localhost seems to work.I can't recall if the Tomcat server needs to be started or if the mod_jk.so automatically handles that. When I try to start the tomcat with startup.bat it gives me the message
JRE_HOME environment variable is not defined correctly
I've set the environment variables from system properties and I could compile/run .java files without problems.
JAVA_HOME C:\Program Files (x86)\Java\jdk1.6.0_16
JRE_HOME C:\Program Files (x86)\Java\jre6
So what's going on here? I installed Visual Studio, but otherwise I cannot think of any reason why the tomcat doesn't work all of the sudden. This is very frustrating, so any help would be much appreciated.
回答1:
Configure paths like this
You can check the validity of the path by typing
echo %JAVA_HOME%
echo %JRE_HOME%
and then everything will work like a charm
回答2:
There is no need to set both the JDK_HOME and JRE_HOME environment variables since JRE_HOME will default to the value of JDK_HOME.
In many Tomcat installations these environment variables are not used at all, being instead set in the optional setenv.bat script. You can find all this documented in section 3 of the RUNNING.txt file in the top level directory of your Tomcat installation and a copy can be found here http://tomcat.apache.org/tomcat-7.0-doc/RUNNING.txt
If you get the "environment variable is not defined correctly" error message you will need to check your setenv.bat file (if you have one) as well as the actual environment variables. By inspection of setclasspath.bat you can see which files it needs to see in those directories. For the JRE it expects to find both %JRE_HOME%\bin\java.exe and %JRE_HOME%\bin\javaw.exe
In my experience this error occurs when the JRE or JDK has been subsequently removed or uninstalled.
回答3:
If you have not installed the SDK, then provide the JRE path and logout and in - this should work
回答4:
I recently ran into this issue, and regardless of how many times I checked.. the variable was set in the windows advanced system properties.
What I found was that if the JRE_HOME var wasn't set, the system would default to the JRE that was part of the JDK in the JAVA_HOME directory. If you're running into this problem, and cannot resolve it.. try deleting the JRE_HOME variable.
That resolved the issue for me.
回答5:
I face with the same problem and I solve it by changing tomcat configuration in Intellij from its default to my own jre folder like the image below :
回答6:
So, I installed Apache Tomcat/7.0.30 and now the startup runs perfectly. No more 503 error and I can run the JSP stuff from other machines as I should be.
Problem is solved, but the mystery remains. It seems that jdk had nothing to do with the problem. Did my tomcat die of old age or something?
回答7:
windows 7. tomcat 8 I was having the same problem. I was getting the ire_environment error. I applied HimalayanCoder's solution. To my surprise, the echo failed to see the java_home or the ire_home. I checked both paths and settings in enviro and both were correct. I rebooted my machine 5 times, and the echo for the java_home worked, but the ire_home still was not showing. tomcat is still not working and I am still getting jre_home error. I kept rebooting machine and after an addition 5 reboots, the jre_home path came through. my tomcat now works.
thanks HimalayanCoder.
回答8:
Path has some other version of java like JDK1.6. Please remove the unwanted version in the path, then start the Tomacat 7.
After trying all the possible answers I have checked my path and then I have removed the Java1.6 from the path, then started the tomcat. It worked for me.
回答9:
I just resolved this issue by deleting the JRE_HOME variable.As it was saying "JRE_HOME variable is not set to this path (Apache\bin)."
来源：https://stackoverflow.com/questions/12492878/jre-home-variable-missing-with-tomcat-win7