配置上下文查找以在Tomcat 8上找到JNDI资源环境

Question

I have a servlet that has a class that needs to reference a value from Tomcat 8's global JNDI resources. I have defined the resource in the Tomcat server.xml file as such:

<GlobalNamingResources>

<Environment name="MAX_LANDMARK_RESULT" value="100000" type="java.lang.Integer" override="false"/>

</GlobalNamingResources>

I defined a resource link in the webapp context.xml:

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/pathname">
    <ResourceLink name="MAX_QUERY" global="MAX_LANDMARK_QUERY" type="java.lang.Integer"/>
</Context>

I also defined the reference in the servlet web.xml:

<resource-env-ref>
        <resource-env-ref-name>MAX_LANDMARK_QUERY</resource-env-ref-name>
        <resource-env-ref-type>java.lang.Integer</resource-env-ref-type>
</resource-env-ref>

and I'm trying to reference it in my servlet like this:

try {
        Context ct = new InitialContext();
        Context ctx = (Context) ct.lookup("java:comp/env");
        MAX_QUERY_SIZE = (Integer)ctx.lookup("MAX_QUERY");
    } catch (NamingException ex) {
        MAX_QUERY_SIZE = 99999;
    }

I've triple checked how I set up the XML files, and they should be correct, so I'm certain that the issue comes from how I'm defining the ct.lookup("java:comp/env"); line. How can I define it so it finds the correct resource instead of throwing a NamingException?

EDIT: So I have been diving into the debugger and checking my context, and MAX_QUERY is showing up as an inherited resource link that links to MAX_LANDMARK_QUERY. Should I be doing something special when pulling that resource link so it references MAX_LANDMARK_QUERY in my code?

Answer 1

For anyone else who is having the same problem, I found a solution.

<Environment> should be defined inside the Tomcat context.xml file. This is the only definition you have to make for the value.

Inside your code, you should call it as such:

Context ctx = new InitialContext();
value = (valuetype) ctx.lookup("java:/comp/env/valueName");