我们有一个 java web 应用程序,它通过 JMS 发送 (JobsController.java) 和接收消息 (JMSMessageListener.java)。在恒定负载下运行应用程序 24 小时并进行堆转储后,我观察到内存使用量不断增加,应用程序在空闲状态下不会放手。我知道这会导致 java 堆内存不足的问题。
JobsController 是一个 ejb 无状态 bean,它的资源在每次调用后都会被正确销毁。JMSMessageListener 由 ejb 全局 bean 池处理,并重用其实例。
我可以从 Java 堆转储中看到的嫌疑人是
- EJB bean 注入导致内存泄漏 https://blog.akquinet.de/2017/01/04/dont-get-trapped-into-a-memory-leak-using-cdi-instance-injection/
- ActiveMQConnection.finalize()。如果它是罪魁祸首,那么它必须发生在所有这些 wildfly activemq 部署中。任何提示表示赞赏。
ActiveMQConnection.java
@Override
protected final void finalize() throws Throwable {
if (!closed) {
if (this.factoryReference.isFinalizeChecks()) {
ActiveMQJMSClientLogger.LOGGER.connectionLeftOpen(creationStack);
}
close();
}
工作控制器
@Stateless 公共类JobsController
{
@Inject
private JMSContext jmsContext;
private Connection connection;
private Session session;
private MessageProducer jmsProducer;
@Resource(lookup = "java:/ConnectionFactory")
private ConnectionFactory connectionFactory;
@Resource(lookup = JAVA_JMS_JOB_QUEUE)
private Queue jobQueue;
@Resource(lookup = JAVA_JMS_QUEUE)
private Queue progressQueue;
@PreDestroy
void release() {
try {
if (jmsProducer != null) {
jmsProducer.close();
}
if (session != null) {
session.close();
}
if (jmsContext != null) {
jmsContext.close();
}
if (connection !=null) {
connection.close();
}
} catch (JMSException e) {
LOG.warn("failed to close JMS resources: {}", e.getMessage());
}
}
public synchronized MessageProducer getJmsProducer() {
if (jmsProducer == null) {
try {
connection = connectionFactory.createConnection();
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
jmsProducer = session.createProducer(jobQueue);
connection.start();
} catch (JMSException e) {
LOG.error("failed to setup JMS message producer: {}", e.getMessage());
}
}
return jmsProducer;
}
public void addMessageToProgressQueue(ProgressMessage progressMessage) {
ObjectMessage objectMessage = jmsContext.createObjectMessage(progressMessage);
try {
getJmsProducer().send(progressQueue, objectMessage);
} catch (JMSException e) {
LOG.error("failed to send progress message {}: {}", objectMessage, e.getMessage());
}
}
}
JMSMessageListener.java
@MessageDriven(name = "JMSMessageListener", mappedName = JAVA_JMS_QUEUE, activationConfig = {
@ActivationConfigProperty(
propertyName = "acknowledgeMode",
propertyValue = "Auto-acknowledge"),
@ActivationConfigProperty(
propertyName = "destinationType",
propertyValue = "javax.jms.Queue"),
@ActivationConfigProperty(
propertyName = "destination",
propertyValue = JAVA_JMS_QUEUE)
})
public class JMSMessageListener implements MessageListener {
private static Logger LOG = LoggerFactory.getLogger(JMSMessageListener.class);
@EJB
private JobsController jobsController;
private final ObjectMapper progressMessageMapper;
public JMSMessageListener() {
progressMessageMapper = new ObjectMapper();
progressMessageMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
}
@Override
public void onMessage(Message message) {
ProgressMessage progressMessage = null;
try {
if (message instanceof BytesMessage) {
BytesMessage bytesMessage = (BytesMessage) message;
int TEXT_LENGTH = new Long(bytesMessage.getBodyLength()).intValue();
byte[] textBytes = new byte[TEXT_LENGTH];
bytesMessage.readBytes(textBytes, TEXT_LENGTH);
String progressText = new String(textBytes, "UTF-8");
progressText = progressText.replaceAll("'totalSteps': None", "'totalSteps': 0");
progressMessage = progressMessageMapper.readValue(progressText, ProgressMessage.class);
} else if (message instanceof ObjectMessage) {
progressMessage = message.getBody(ProgressMessage.class);
}
if (progressMessage != null) {
jobsController.sendProgressMessage(progressMessage);
} else {
LOG.error("An empty progress message was received");
}
} catch (JMSException | IOException e) {
LOG.error("failed to process progress message: {}", e.getMessage(), e);
}
}
}