Looks you already have installed QTP 11 and trying to work it. May be you are using an trial version.
Trial version gives you all add-ins as well. You might not have installed Java add-in.
Rerun the setup file , select 'Modify' and proceed. You get a add-in screen. Select the 'small dropdown' kind of things next to Java in the tree and select the option to install on local hard drive. Then proceed with usual installation.
This will give you Java add-in for trial. The trial period is same for all add-ins.
Let me know if this helps or if you are looking for something else.
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( Posts and opinions made here are my own and do not reflect the opinions of my employer HPE in any way . )