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Questions tagged [autocloseable]

java.lang.AutoCloseable is an interface which, when implemented by a class, can be used in the try-with-resources Statement. It is ensured that resource/class object is closed at the end of the statement.

The try-with-resources statement is a try statement that declares one or more resources. A resource is an object that must be closed after the program is finished with it. The try-with-resources statement ensures that each resource is closed at the end of the statement. Any object that implements java.lang.AutoCloseable, which includes all objects which implement java.io.Closeable, can be used as a resource.

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Java Connection Pool and try-with statements: Is Connection actually closed or returned to pool?

I have a jdbc connection pool using the KeyedObjectPool class and i use it via the implemented methods openConnection() and closeConnection(). closeConnection() normally just returns the connection to the pool and closes it only if it has been used…
flixe
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Error: trouble processing "java/lang/AutoCloseable.class"

When I compile my project, I am getting this error: trouble processing java/lang/AutoCloseable.class Please help me sort this out.
Khyati Chitroda
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When to use JDO DataNucleus Query.close()

I was not able to find are clear documentation when to use the close() Method of the Query Object. In the following example the try with resources closes the PersistenceManager and the Query by calling Autocloseable.close(). Internally Query.close()…
Juri Adam
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What version of dropwizard-hibernate supports try with resources?

I am aware that the try with resources feature is available from Java 7 onwards, I was hoping the later versions of dropwizard hibernate would provide a Sessions object that implement the autocloseable interface. I wasnt able to see that in the…
user_mda
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Bounded Type Parameter with Multiple Bounds RandomAccessFile & DataInputStream throws java.lang.NoSuchMethodError: java.io.DataInput.close()V

I am trying to extend “Intersection of interfaces”. So: the example that I am following is trying to find superinterfaces for RandomAccessFile (Implemented Interfaces: Closeable, DataInput, DataOutput, AutoCloseable ) and…
trinity
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Working with Closeable and AutoCloseable

I have this code: public class C implements Closeable{ private Integer i = 0; public C () { } public C (Integer i) { this.i = i; } @Override public void close() throws IOException { System.out.println("close " + this.i); } public void m1(C…
o.hujs
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Will a PrintWriter without assignment to a variable close after using?

Is new PrintWriter(ExampleStream).print("Just Something"); same as PrintWriter pw = new PrintWriter(ExampleStream); pw.print("Just Something"); pw.close(); So will the PrintWriter close?
nickkoro
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How to enforce release of resources?

I have a class called Parameter that wraps different values including java.sql.Clob With JDBC4 specification, we have a free() method that can be called to free resources allocated to Clob object. I am thinking of making Parameter class an…
VishalDevgire
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Is there any harm in failing to close a file when a Java program terminates?

When my program starts, it opens a file and writes to it periodically. (It's not a log file; it's one of the outputs of the program.) I need to have the file available for the length of the program, but I don't need to do anything in particular to…
Logical Fallacy
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auto closable not working with Scanner

package org.test; import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegTest { public static void main(String[] args) throws InterruptedException { String str = readLine("Enter…
Akshay
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How to use lock wrapper for autocloseable?

I have wrote following wrapepr: public class AutoCloseableLockWrapper implements AutoCloseable, Lock{ private final Lock lock; public AutoCloseableLockWrapper(Lock l) { this.lock = l; } @Override public void lock() { …
gstackoverflow
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Should AutoCloseable Iterator to a ResultSet call close from finalizer?

I have an Iterator backed by a ResultSet. I need that for a row-level post-processing. The iterator implements AutoCloseable inteface. The connection remains open up until we iterate through all the rows / iteration interrupted by the user. And…
amdmax
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What is the new concept of Autocloseable in try block in jdk 1.7

What is the new concept of Autocloseable in try block in jdk 1.7. Is this really required or just to enhance something in try catch block to make it more advance.
Atul_15
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Does AutoCloseable.close() method break Backward compatibilty rule of Java

From Java 7 ,Closeable interface has been retrofitted to extend AutoCloseable interface so that all classes implementing Closeable interface can work with try-with-resources statement. Till now,Closeable interface was free to throw any exception…
Kumar Abhinav
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Wrapping multiple AutoCloseables

try-with-resources is nice and all that, but it seems to me that it is still not sufficient for effective resource management when creating classes that wrap multiple AutoCloseable objects. For example, consider import java.io.*; class…
Paulo
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