is jms connection thread safe?
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The JMS specification states that only ConnectionFactory, Connection and Destinations (Queue and Topic) are thread-safe. The other classes, especially Session and the objects created by Session, can not be shared by threads without synchronization or other precautions.
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"PX Deq: Slave Session Stats" shouldn't be a relevant wait event since it is about the PX slaves at the end of a PX execution passing an array of session statistics to the PX coordinator for aggregating the statistics on coordinator level.
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Yes, sockets are thread-safe, however you have to be careful. ... Having multiple threads receiving data from a socket is usually fine for UDP socket, but doesn't make much sense for TCP sockets most of the time.
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Basically synchronous means one can execute many things in parallel. With this respect Stringbuffer in java is synchronous class ie it allows the access of one single method by different threads in a synchronized manner and Stringbuilder is asynchronous aka not thread safe.
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kjzdattdlm: Can not attach to DLM(instance crash) Because the cluster_interconnects parameter is set incorrectly in the database instances on Exadata, one or more of the instances can be closed with the “kjzdattdlm: Can not attach to DLM” error. The same problem can be seen in ASM instances.
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Local JMX access If you are using a Java SE 6 or later JVM, local JMX management and monitoring are most likely enabled by default.
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2 Answers. No, it doesn't say that static classes are thread safe, it says that public static members are thread safe. For static methods for example, this means that they only use the data that you send in as parameters, or other static members that are also thread safe.
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1 Answer. JMS is an API, not a protocol. Therefore, there could theoretically be a JMS client implementation which uses the SMTP protocol to send messages, but I think this would be unlikely since many of the JMS API concepts would not map to the SMTP/email use-case.
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The TcpListener class provides simple methods that listen for and accept incoming connection requests in blocking synchronous mode. ... Use the Start method to begin listening for incoming connection requests. Start will queue incoming connections until you either call the Stop method or it has queued MaxConnections.
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That RFC clearly states in its abstract that "A UUID is 128 bits long, and can guarantee uniqueness across space and time." {emphasis added} A such, they would be unique across JVMs instances.
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The client simply uses the standard JMS APIs to send messages to a queue and receive messages from another queue. The MDB declares whether it will listen to a queue or topic in the ejb-jar. xml descriptor. The name of the queue or topic must be specified using a jboss.
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Enables the JMX remote agent and creates a remote JMX connector to listen through the specified port. By default, the SSL, password, and access file properties are used for this connector. It also enables local monitoring as described for the com.
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As what I understood, the nature of JMS is asynchronous. Producer publishes messages to the queue/topic, it doesn't need to wait consumer. This is asynchronous behaviour.
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Class JsonParser. Implementation has no fields and therefore thread-safe, but sub-classes are not necessarily thread-safe. If a JSON map is encountered while using a destination class of type Map, then an ArrayMap is used by default for the parsed values.
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Start Java VisualVM on the same machine. In Java VisualVM's Applications window, right click on the Local machine and select 'Add JMX Connection'. The Add JMX Connection dialog box opens. The host name localhost is already filled in.
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['Open the catalina. bat file (TomcatInstallDirectory/bin/catalina. bat).', 'Add the following line: set JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx1024m. where: Xms is the initial (start) memory pool. Xmx is the maximum memory pool.']
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No, it isn't. The instance is stateful. So you need to store it threadlocal, or to obtain a new instance on every encrypt/decrypt call, or to wrap it in a synchronized(cipher) block. ... Even if a Cipher was thread-safe, it would not really be useful to use it from multiple threads concurrently.