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From Problem Solving to Java. Core Java, Vol. I, Fundamentals, 8ed, Prentice-Hall. EE - Spring Patterns A Guided Tour. How to Design Graphical Aplication with Eclipse 3. Patterns AND Practices. The Z Garbage Collector now supports class unloading. By unloading unused classes, data structures related to these classes can be freed, lowering the overall footprint of the application.

High Memory utilization and their root causes - Java Enterprise Performance | Dynatrace

Class unloading in ZGC happens concurrently, without stopping the execution of Java application threads, and has thus zero impact on GC pause times. This feature is enabled by default, but can be disabled using the command line option -XX:-ClassUnloading. Memory-mapped files in these file systems bypass the file cache and provide a direct mapping of virtual memory to the physical memory on the device.

There is no additional flag to enable this feature. The current implementation pre-allocates the full Java heap size in the NV-DIMM file system to avoid problems with dynamic generation sizing. When enabled, the VM also limits the maximum size of the young generation based on available DRAM, although it is recommended that users set the maximum size of the young generation explicitly.

Prior to this fix, Windows Server was recognized as "Windows Server ", which produced incorrect values in the os. New "disallow" and "allow" token options have been added to the java. The "disallow" option can improve run-time performance for applications that never set a security manager. For further details on the behavior of these options, see the class description of java. A new -groupname option has been added to keytool -genkeypair so that a user can specify a named group when generating a key pair. For example, keytool -genkeypair -keyalg EC -groupname secpr1 will generate an EC key pair by using the secpr1 curve.

Because there might be multiple curves with the same size, using the -groupname option is preferred over the -keysize option. Four new JFR events have been added to the security library area. New system and security properties have been added to enable users to customize the generation of PKCS 12 keystores.

This includes algorithms and parameters for key protection, certificate protection, and MacData. The detailed explanation and possible values for these properties can be found in the "PKCS12 KeyStore properties" section of the java. These cipher suites are enabled by default. The following cipher suites are available for TLS 1. When set to "true", a short hostname in a service principal name will be canonicalized to a fully qualified domain name if available. Otherwise, no canonicalization is performed.

The default value is "true". This is also the behavior before JDK By default, they perform transitive module dependence analysis on libraries on the class path and module path, both directly and indirectly, as required by the given input JAR files or classes. Previously, they only reported the modules required by the given input JAR files or classes. The --no-recursive option can be used to request non-transitive dependence analysis. By default, they flag any missing dependency, i. The --ignore-missing-deps option can be used to suppress missing dependence errors.

Note that a custom image is created with the list of modules output by jdeps when using the --ignore-missing-deps option for a non-modular application. Such an application, running on the custom image, might fail at runtime when missing dependence errors are suppressed. The Java language enhances the switch statement so that it can be used as either a statement or an expression. Using switch as an expression often results in code that is more concise and readable.

Both the statement and expression form can use either traditional case Also, both forms can switch on multiple constants in one case. These enhancements to switch are a preview language feature.


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This document includes the identification of removed APIs and features not described here. The descriptions below might also identify potential compatibility issues that you could encounter when migrating to JDK The com. This class was unused in the JDK and has been removed in this release. They have been removed in this release.

The java. The recommended approach to close files is to explicitly call close or to use try-with-resources. The finalize method in java. ZipFile , java. Inflator , and java. Deflator was deprecated for removal in JDK 9 and its implementation was updated to be a no-op. Deflator has been removed in this release. Subclasses that override finalize in order to perform cleanup should be modified to use alternative cleanup mechanisms and to remove the overriding finalize method.

The removal of the finalize methods will expose Object. Compilation errors might occur on the override of finalize due to the change in declared exceptions. Previously, only java. IOException was declared. This string is most apparent to end users in the output of the java --version command, and related commands. For example, with JDK As a consequence the system property java.

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For example, the output of the JDK 12 java --version command will be of the form:. The relevant difference with respect to JDK 11 is the absence of Existing programs or scripts that expect the java. You should be aware of the contents in those documents as well as the items described in this release notes page. The descriptions below also identify potential compatibility issues that you might encounter when migrating to JDK Use of this flag will result in a warning being issued.


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This option may be removed completely in a future release. The default -keyalg value for the -genkeypair and -genseckey commands of keytool have been deprecated. If a user has not explicitly specified a value for the -keyalg option a warning will be shown. An additional informational text will also be printed showing the algorithm s used by the newly generated entry.

In a subsequent JDK release, the default key algorithm values will no longer be supported and the -keyalg option will be required. The following notes describe additional changes and information about this release. In some cases, the following descriptions provide links to additional detailed information about an issue or a change.

Incorrect Cache Usage

Affected applications on such configurations should specify the system property -Djdk. The initial value of the user. The first time the default timezone is needed, if user. Previously, the initial value was the empty string. In JDK 12, System.