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POHow to handle wait() notify()?
 

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    <p>Here I have two run methods which should synchronize each other.</p> <p>Poller Class:</p> <pre><code> */ public void run() { int seqId = 0; while(true) { List&lt;KpiMessage&gt; list = null; try{ if(!accumulator.isUsed){ try { list = fullPoll(seqId); if (!list.isEmpty()) { seqId = list.get(0).getSequence(); accumulator.manageIngoing(list); } System.out.println("Updated"); wait(); } catch (Exception e1) { e1.printStackTrace(); } } } catch (Exception e){ // TODO: System.err.println(e.getMessage()); e.printStackTrace(); } } } /** * Method which defines polling of the database and also count the number of Queries * @param lastSeq * @return pojo col * @throws Exception */ public List&lt;KpiMessage&gt; fullPoll(int lastSeq) throws Exception { Statement st = dbConnection.createStatement(); System.out.println("Polling"); ResultSet rs = st.executeQuery("Select * from msg_new_to_bde where ACTION = 814 and STATUS = 200 order by SEQ DESC"); List&lt;KpiMessage&gt; pojoCol = new ArrayList&lt;KpiMessage&gt;(); try { while (rs.next()) { KpiMessage filedClass = convertRecordsetToPojo(rs); pojoCol.add(filedClass); } for (KpiMessage pojoClass : pojoCol) { System.out.print(" " + pojoClass.getSequence()); System.out.print(" " + pojoClass.getTableName()); System.out.print(" " + pojoClass.getAction()); System.out.print(" " + pojoClass.getKeyInfo1()); System.out.print(" " + pojoClass.getKeyInfo2()); System.out.print(" "+ pojoClass.getStatus()); System.out.println(" " + pojoClass.getEntryTime()); } } finally { try { st.close(); rs.close(); } catch (Exception e) { System.err.println(e.getMessage()); e.printStackTrace(); } } </code></pre> <p>Processing and Updating Class:</p> <pre><code> public void run() { while(true){ try { while(!accumulator.isUsed) { try { System.out.println("Waiting for new outgoingmessages"); this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } Collection&lt;KpiMessage&gt; outgoingQueue = generate(accumulator.outgoingQueue); accumulator.manageOutgoing(outgoingQueue, dbConnection); } catch (Exception e) { System.err.println(e.getMessage()); e.printStackTrace(); } } } } </code></pre> <p>I have a logical error:</p> <p>The poller is polling not only for new messsage but also reads the DB again and again from the first.</p> <p>Also Updates again and again.</p> <p><strong>How to solve this synchronization problem</strong>.</p>
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    1. COYou should only include the required part of the code and not dump the whole program. Update db method has nothing to do with IllegalMonitorStateException
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      1. USNarendra Pathai
    2. CO@NarendraPathai I have updated...
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    3. COOP had the same question before: http://stackoverflow.com/questions/14772236/illegal-monitor-state-exception
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