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How to use ExecuteService with custom Threads that contain a AutoCloseable resource


By : Akshay Singh
Date : October 17 2020, 06:10 AM
this one helps. You don't need any custom thread. All you need is to create and submit a Callable that creates a processor, calls the function, and closes the processor:
code :
public <T> T handle(Function<Processor, T> request) {
    Callable<T> callable = () -> {
        try(Processor processor = Processor.createNewProcessor()) {
            request.apply(processor);
        } 
    }
    return executor.submit(callable).get();
}


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Try-With Resource when AutoCloseable is null


By : Tim
Date : March 29 2020, 07:55 AM
Any of those help The Java Language Specification specifies that it is closed only if non-null, in section 14.20.3. try-with-resources:
code :
try ( IRemoteLogger remoteLogger = getRemoteLoggerMaybe() ) {
    if ( null != remoteLogger ) {
       ...
    }
}

AutoCloseable contract: writing to resource allowed in close()?


By : muhammad kazwan
Date : March 29 2020, 07:55 AM
I wish did fix the issue. There are examples in the Java Standard class libraries where the close() method has to perform a write. One such example is DeflaterOutputStream whose javadoc states:

How to implement Autocloseable for resource opened on construction


By : Kevin
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further That is not possible with the try-with-resource concept, which is for local scope only. The way you close the Metrics within your close() is the best you can do.
You best bet is to have SomeWriter also implement AutoCloseable and use the writer itself in the try-with-resources block, as in
code :
try (SomeWriter writer = new SomeWriter()) {
}
// here, the Metrics will also have been closed.

AutoCloseable Delayed Execution in try-resource-block


By : Chris
Date : March 29 2020, 07:55 AM
Hope this helps The close() is called immediately. However when you try to determine this empirically, you are only as reliable as your benchmark.
BTW If you call System.nanoTime() in a tight loop, you can see jumps in time of 1 - 50 ms due to the process being rescheduled. You can see this on your machine by running this test tools https://github.com/OpenHFT/Java-Thread-Affinity/blob/master/affinity/src/main/java/net/openhft/affinity/MicroJitterSampler.java
code :
public static void main(String... args) {
    try (PrintWriter pw = new PrintWriter(System.out)) {
        pw.println("Hello World");
    }
}
   L11
    LINENUMBER 13 L11
    NEW java/io/PrintWriter
    DUP
    GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
    INVOKESPECIAL java/io/PrintWriter.<init> (Ljava/io/OutputStream;)V
    ASTORE 1
   L12
    ACONST_NULL
    ASTORE 2
   L3
    LINENUMBER 14 L3
    ALOAD 1
    LDC "Hello World"
    INVOKEVIRTUAL java/io/PrintWriter.println (Ljava/lang/String;)V
   L4
    LINENUMBER 15 L4
    ALOAD 1
    IFNULL L13
    ALOAD 2
    IFNULL L14
   L0
    ALOAD 1
    INVOKEVIRTUAL java/io/PrintWriter.close ()V
   L1
    GOTO L13
   L2

Hibernate "The resource type Session does not implement java.lang.AutoCloseable"


By : Gyan garg
Date : March 29 2020, 07:55 AM
wish of those help First, you should use a much more solid session/transaction handling infrastructure, like Spring offers you. This way you can use the Same Session across multiple DAO calls and the transaction boundary is explicitly set by the @Transactional annotation.
If this is for a test project of yours, you can use a simple utility like this one:
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