我正在使用NetBeans IDE和Java EE與glassfish3服務器編寫程序。目前我有2個線程,A和B.他們都在彼此之間來回發送消息。我遇到的問題是這樣的:Java消息傳遞服務 - 未收到消息
1. A sends a message, M1, to B
2. B receives M1
3. B sends M2 to A
4. A hangs waiting on M2
這裏是我的代碼:
線程A:
//required declarations
producer = session.createProducer(AtoBQueue);
m1 = session.createMapMessage();
m1.setString("m1", "m1Val");
m1.setJMSReplyTo(BtoAQueue);
flag = true;
producer.send(m1);
consumer = session.createConsumer(BtoAQueue);
connection.start();
if(flag){
m2 = (MapMessage) consumer.receive();
String m2Val = m2.getString("m2");
if(m2Val.equals("true")){
flag2 = true;
}
}
...
線程B:
consumer = session.createConsumer(AtoBQueue);
connection.start();
while(true){
m1 = (MapMessage) consumer.receive();
m1Val = m1.getString("m1");
if(m1Val != null){
flag = true;
}
MessageProducer producer = session.createProducer((Queue m1.getJMSReplyTo());
m2 = session.createMapMessage();
if(m1Val != null){
if(m1Val.equals("m1Val")){
m2.setString("m2", "m2Val");
m2.setJMSReplyTo(AtoBQueue);
producer.send(m2);
}
}
...
}
哦哎呦。我將它改爲m1。我簡化了我的代碼,並且意外地將它留在了那裏。但這不是我的問題。我遇到的問題是A沒有收到m2 – user972276