直接内存如果不设置和-Xmx(堆最大)一样。可通过参数-XX:MaxDirectMemorySize来设置直接内存。直接内存一般和NIO有关,DirectByteBuffer中通过Unsafe去操作的直接内存,DirectByteBuffer是通过计算知道内存不足抛出的异常,unsafe.allocateMemory()才是去申请内存的方法。测试代码如下图: 测试参数:-Xms20m -XX:MaxDirectMemor...
This release contains fixes for security vulnerabilities. For more information, seeOracle Java SE Critical Patch Update Advisory. Changes in 1.4.2_40 The full internal version number for this update release is 1.4.2_40-b04 (where "b" means "build"). The external version number is 1.4.2_40...
memory = 33554432 client.dns.lookup = use_all_dns_ips client.id = producer-2 compression.type = none connections.max.idle.ms = 540000 delivery.timeout.ms = 120000 enable.idempotence = false interceptor.classes = [] internal.auto.downgrade.txn.commit = false key.serializer = class org....
Increase the XX:MaxPermSize parameter in 256MB increments until the error stops occurring. If your error does not reference PermGen, there is no need to increase it PermGen is used to store classes, and is generally quite static in size. It's been removed as of Java 8. Settin...
之前做项目都是照葫芦画瓢,从来没系统性的学习过java、spring、springboot,现在下定决心从0开始学习,本文章只为记录个人遇到的一系列问题,并直接写出来以加深印象。 java部分和spring部分没记录,直接从spring boot开始到spring cloud结束。 知识点 用idea初始化spring boot项目后,maven装的特别慢:需要配置maven镜像。
Sun JavaTMSystem Directory Server Enterprise Edition 提供可在複寫環境中管理多重伺服器、實例與尾碼的瀏覽器介面與指令行工具。本章提供有關目錄伺服器管理工具的簡介資訊。 本章包含下列主題: 目錄伺服器管理簡介 決定DSCC 與指令行的使用時機 目錄服務控制中心介面 ...
Standard Options for Java: Options guaranteed to be supported by all implementations of the Java Virtual Machine (JVM). They're used for common actions, such as checking the version of the JRE, setting the class path, enabling verbose output, and so on. ...
Metaspace- Metaspace stores the class definitions of your objects. The size of Metaspace is controlled by setting-XX:MetaspaceSize. Additional JVM overhead- In addition to the above, some memory is consumed by the JVM itself. This holds the C libraries for the JVM and some C memory allocation...
MonitorSettingException MouseAdapter MouseDragGestureRecognizer MouseEvent MouseEvent MouseInfo MouseInputAdapter MouseInputListener MouseListener MouseMotionAdapter MouseMotionListener MouseWheelEvent MouseWheelListener MultiButtonUI MulticastSocket MultiColorChooserUI MultiComboBoxUI MultiDesktopIco...
Setting the networking property http.auth.digest.quoteParameters to true restores the JDK 7 behavior for compatibility with the older versions of Tomcat.See 8034170(not public).Area: tools/javacSynopsis: javac crashes when mixing lambdas and inner classes...