diff --git a/test/org.jkiss.dbeaver.ext.test/src/org/jkiss/dbeaver/ext/test/TestDeadlock.java b/test/org.jkiss.dbeaver.ext.test/src/org/jkiss/dbeaver/ext/test/TestDeadlock.java
new file mode 100644
index 0000000000000000000000000000000000000000..c4248cbfb5ac2fc41d064721c49378bdfb133ee3
--- /dev/null
+++ b/test/org.jkiss.dbeaver.ext.test/src/org/jkiss/dbeaver/ext/test/TestDeadlock.java
@@ -0,0 +1,51 @@
+/*
+ * DBeaver - Universal Database Manager
+ * Copyright (C) 2010-2021 DBeaver Corp and others
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jkiss.dbeaver.ext.test;
+
+public class TestDeadlock {
+
+    static A a = new A();
+    static B b = new B();
+
+    private static class A {
+        synchronized void doSomething() {
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            b.doSomethingElse();
+        }
+    }
+
+    private static class B {
+        synchronized void doSomethingElse()  {
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            a.doSomething();
+        }
+    }
+
+    public static void main(String[] args) {
+        new Thread(() -> a.doSomething()).start();
+        new Thread(() -> b.doSomethingElse()).start();
+    }
+
+}