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<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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JBoss cache. Concurrency issue
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created by <a href="http://community.jboss.org/people/aaauser">Anton K</a> in <i>JBoss Cache</i> - <a href="http://community.jboss.org/message/636461#636461">View the full discussion</a>
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<div class="jive-rendered-content"><p style="margin-bottom: 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">I'm using <em>JBossCache 'Malagueta' 3.2.0.GA</em></p><p style="margin-bottom: 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">I faced with strange issue in production environment, sometimes writes to jboss are lost. I tried to reproduce this situation with simple java application</p><pre class="lang-java prettyprint" style="margin-bottom: 10px; font-size: 14px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; color: #000000; padding: 5px;"><code style="background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="kwd" style="color: #00008b;">public</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">static</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">void</span><span class="pln"> testCache</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln"><br/>    </span><span class="typ" style="color: #2b91af;">Cache</span><span class="pln"> cache </span><span class="pun">=</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">new</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">DefaultCacheFactory</span><span class="pun">().</span><span class="pln">createCache</span><span class="pun">(</span><span class="kwd" style="color: #00008b;">false</span><span class="pun">);</span><span class="pln"><br/>    cache</span><span class="pun">.</span><span class="pln">create</span><span class="pun">();</span><span class="pln"><br/>    cache</span><span class="pun">.</span><span class="pln">start</span><span class="pun">();</span><span class="pln"><br/>    </span><span class="kwd" style="color: #00008b;">final</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">Node</span><span class="pln"> node </span><span class="pun">=</span><span class="pln"> cache</span><span class="pun">.</span><span class="pln">getRoot</span><span class="pun">().</span><span class="pln">addChild</span><span class="pun">(</span><span class="typ" style="color: #2b91af;">Fqn</span><span class="pun">.</span><span class="pln">fromString</span><span class="pun">(</span><span class="str" style="color: #800000;">"/child1"</span><span class="pun">));</span><span class="pln"><br/>    </span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> threadsCount </span><span class="pun">=</span><span class="pln"> </span><span class="lit" style="color: #800000;">20</span><span class="pun">;</span><span class="pln"><br/>    </span><span class="kwd" style="color: #00008b;">final</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">CyclicBarrier</span><span class="pln"> b </span><span class="pun">=</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">new</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">CyclicBarrier</span><span class="pun">(</span><span class="pln">threadsCount</span><span class="pun">);</span><span class="pln"><br/>    </span><span class="kwd" style="color: #00008b;">for</span><span class="pln"> </span><span class="pun">(</span><span class="kwd" style="color: #00008b;">int</span><span class="pln"> i </span><span class="pun">=</span><span class="pln"> </span><span class="lit" style="color: #800000;">0</span><span class="pun">;</span><span class="pln"> i </span><span class="pun"><</span><span class="pln"> threadsCount</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"><br/>        </span><span class="kwd" style="color: #00008b;">final</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">long</span><span class="pln"> j </span><span class="pun">=</span><span class="pln"> i</span><span class="pun">;</span><span class="pln"><br/>        </span><span class="kwd" style="color: #00008b;">new</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">Thread</span><span class="pun">(</span><span class="kwd" style="color: #00008b;">new</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">Runnable</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln"><br/>            </span><span class="lit" style="color: #800000;">@Override</span><span class="pln"><br/>            </span><span class="kwd" style="color: #00008b;">public</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">void</span><span class="pln"> run</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln"><br/>                </span><span class="kwd" style="color: #00008b;">try</span><span class="pln"> </span><span class="pun">{</span><span class="pln"><br/>                    b</span><span class="pun">.</span><span class="pln">await</span><span class="pun">();</span><span class="pln"><br/>                    </span><span class="typ" style="color: #2b91af;">String</span><span class="pln"> name </span><span class="pun">=</span><span class="pln"> </span><span class="typ" style="color: #2b91af;">RandomGenerator</span><span class="pun">.</span><span class="pln">getRandomName</span><span class="pun">(</span><span class="lit" style="color: #800000;">4</span><span class="pun">);</span><span class="pln"><br/>                    node</span><span class="pun">.</span><span class="pln">put</span><span class="pun">(</span><span class="pln">j</span><span class="pun">,</span><span class="pln"> name</span><span class="pun">);</span><span class="pln"><br/>                    </span><span class="typ" style="color: #2b91af;">String</span><span class="pln"> nameFromCache </span><span class="pun">=</span><span class="pln"> </span><span class="pun">(</span><span class="typ" style="color: #2b91af;">String</span><span class="pun">)</span><span class="pln"> node</span><span class="pun">.</span><span class="pln">get</span><span class="pun">(</span><span class="pln">j</span><span class="pun">);</span><span class="pln"><br/>                    </span><span class="kwd" style="color: #00008b;">if</span><span class="pln"> </span><span class="pun">(!</span><span class="pln">name</span><span class="pun">.</span><span class="pln">equals</span><span class="pun">(</span><span class="pln">nameFromCache</span><span class="pun">))</span><span class="pln"> </span><span class="pun">{</span><span class="pln"><br/>                        </span><span class="typ" style="color: #2b91af;">System</span><span class="pun">.</span><span class="pln">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str" style="color: #800000;">"error"</span><span class="pun">);</span><span class="pln"><br/>                    </span><span class="pun">}</span><span class="pln"><br/>                </span><span class="pun">}</span><span class="pln"> </span><span class="kwd" style="color: #00008b;">catch</span><span class="pln"> </span><span class="pun">(</span><span class="typ" style="color: #2b91af;">Exception</span><span class="pln"> e</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"><br/>                    e</span><span class="pun">.</span><span class="pln">printStackTrace</span><span class="pun">();</span><span class="pln"><br/>                </span><span class="pun">}</span><span class="pln"><br/>            </span><span class="pun">}</span><span class="pln"><br/>        </span><span class="pun">}).</span><span class="pln">start</span><span class="pun">();</span><span class="pln"><br/>    </span><span class="pun">}</span><span class="pln"><br/></span><span class="pun">}</span><span class="pln"><br/></span></code></pre><p style="margin-bottom: 1em; font-size: 14px; background-color: #ffffff; color: #000000; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif;">From time to time, this test output "error", which i run from <code style="padding-top: 1px; padding-right: 5px; padding-bottom: 1px; padding-left: 5px; background-color: #eeeeee; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;">static void mai</code>. 1 of 3 runs return "error" msg, node simply return "null".  I can't reproduce it on every machine</p></div>
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<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/636461#636461">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Cache at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2052">Community</a></p>
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