diff --git a/README.md b/README.md
index 6121cc8..395cd4c 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ If the test file is missing you can create it on the fly.
 
 - In PHP if you open `src/Name/App.php` and issue `tt` the plugin tries to open `tests/Name/AppTest.php`
 - In Golang if you open `boat.go` and issue `tt` the plugin tries to open `boat_test.go`
+- In Java if you open the class AppController.java under the package com.mycompany.App and issue ``tt`` the plugin tries to open the class `AppControllerTest.java` under the same package
 
 ... And viceversa! ;-)
 
diff --git a/plugin/relatedtest.vim b/plugin/relatedtest.vim
index 49f5a5e..f096f74 100644
--- a/plugin/relatedtest.vim
+++ b/plugin/relatedtest.vim
@@ -16,6 +16,23 @@ if !exists('g:relatedtest_open_command')
     let g:relatedtest_open_command = 'tt'
 endif
 
+let available_extensions = [
+    \ '\.php$',
+    \ '\.go$',
+    \ '\.java$'
+    \ ]
+
+let is_available = 0
+for pattern in available_extensions
+    if bufname('%') =~ pattern
+        let is_available = 1
+    endif
+endfor
+
+if is_available == 0
+    finish
+endif
+
 function! g:relatedTestHandleTT()
     let a:bufname = bufname('%')
     if b:relatedTestIsTest(a:bufname) > 0