sql developer unable to find java virtual machine

(anti-theft connection: This paper first from the http://www.cnblogs.com/jilodream/) domain is a constant pool. The data in the constant pool will exist in the runtime constant pool after the class is loaded. The constant pool in class files mainly includes various literal and symbolic references. Symbol references are involved in stack frames. A literal can be understood as a constant in java, such as a string or a final variable. Symbol Reference r

name recognition, such as Rt.jar, the class library whose name does not conform, even if placed in the specified path will not be loaded) class library into the memory of the virtual machine, the startup ClassLoader cannot be directly referenced by the Java program.(2). Extension ClassLoader: The extension class loader, implemented by Sun.misc.launcher$extclassl

One, Java Virtual machine logical recovery mechanism1. Java Garbage collectorThe Java garbage collector is one of the three important modules of the Java Virtual

A brief description of the memory area of Java: Run-time data region Hotspot Virtual Machine Object I. Overviewsecond, run-time data area2.1 Program CountersProgram Counter Register, which represents the line number indicator of the byte code executed by the current thread, the PC in the operating system, both of which are a concept. Execution i

class, because the Testapplet is not in the load path of the system loader, so the system loader does not find this class, and there is no load success.Then the ACL itself loads the testapplet. The ACL successfully found the Testapplet.class file through the network and imported it into the JVM. During the load process, the JVM discovers that Testappet is inherited from the superclass Java.applet.Applet.So the JVM calls the ACL again to load the Java

Preface Recently found that sometimes after reading a book, time is easy to forget, reading does not summarize the effect of a large discount, it is intended to write this series of articles, one is to tidy up the main points in the book, to help their digestion and understanding; the second is to encourage themselves to read more thinking. The article will not explain the contents of the book is very detailed, but summed up, suitable for the reader has read the book. 2nd Chapter:

cenozoic and older generations, and when new objects are created, they typically allocate memory space in the Cenozoic, and when the next generation garbage collector recovers several times, the surviving objects are moved to the old generation memory. When large objects cannot find enough contiguous memory in the Cenozoic, they are created directly in the old generation.Now the Java

code into the invokespecial command when compiling the Java source code. When the Java Virtual Machine parses a symbolic reference pointing to the superclass in the invokespecial command. It dynamically searches for the current superclass. Find the implementation of this me

I. OverviewFor developers of C and C + + programs, in memory management, programmers have absolute access to memory, but also primarily to the correct use and cleanup of memory, which requires a high level of programmer.For Java programmers, with the help of the automatic memory management mechanism of the virtual machine, it is no longer necessary to write the p

Program Counter Register: A small amount of memory space that can be seen as the line number indicator of the byte code executed by the current thread. The bytecode interpreter works by changing the value of this counter to select the next byte-code instruction that needs to be executed, such as branching, looping, jumping, exception handling, thread recovery, and other basic functions that rely on this counter to complete. The multithreading of the Java