无法从Netbeans 7.4启动derby数据库 [英] Unable to start derby database from Netbeans 7.4

问题描述

我下载了Netbeans 7.4和Java 7 Update 51.当我尝试从Netbeans启动Java DB或derby连接时出现以下错误。这是在Windows 8 PC上。我在工作时下载了windows xp 32 bit的版本。它工作正常。我不确定缺少什么。

I downloaded Netbeans 7.4 and Java 7 Update 51. I get the below error when I try to start Java DB or derby connection from Netbeans. This is on a windows 8 PC. I downloaded the version for windows xp 32 bit at work. It works fine. I am not sure what is missing.

Thu Jan 16 00:48:23 EST 2014 : Security manager installed using the Basic server security policy.
Thu Jan 16 00:48:24 EST 2014 : access denied ("java.net.SocketPermission" "localhost:1527" "listen,resolve")
java.security.AccessControlException: access denied ("java.net.SocketPermission" "localhost:1527" "listen,resolve")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:372)
at java.security.AccessController.checkPermission(AccessController.java:559)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.lang.SecurityManager.checkListen(SecurityManager.java:1134)
at java.net.ServerSocket.bind(ServerSocket.java:375)
at java.net.ServerSocket.<init>(ServerSocket.java:237)
at javax.net.DefaultServerSocketFactory.createServerSocket(ServerSocketFactory.java:231)
at org.apache.derby.impl.drda.NetworkServerControlImpl.createServerSocket(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.access$000(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.derby.impl.drda.NetworkServerControlImpl.blockingStart(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.executeWork(Unknown Source)

at org.apache.derby.drda.NetworkServerControl.main(Unknown Source)

推荐答案

这就是我所做的：

1. 通过执行此指令确切了解java home的位置来自NetBeans 7.4：

1. Find out exactly where the java home is by executing this instruction from NetBeans 7.4 :

System.out.println(System.getProperty("java.home"));

这是我案例的输出：

C:\Program Files\Java\jdk1.7.0_51\jre

这对m非常重要e，我正在修改另一个 java.policy 并且没有任何效果并浪费了我几个小时。

which is quite important for me, I was modifying another java.policy and took no effect and wasted me a couple of hours.

出于的原因，java.policy 是一个unix样式文件并且是只读的，我用notepad ++打开并编辑它并以管理员身份执行（在同一个java主目录下）：

For reason of java.policy is an unix style file and read-only, I opened and edited it with notepad++ and executed as administrator (under the same java home):

C:\Program Files\Java\jdk1.7.0_51\jre\lib\security\java.policy

在第一次授予后，只将这些行添加到文件中：

Add only these lines into the file after the first grant:

grant {
    permission java.net.SocketPermission "localhost:1527", "listen";
};

保存文件，由于许可的原因，这有点棘手。但是如果您以管理员身份运行notepad ++或任何其他编辑程序，则可以解决问题。

然后尝试从NetBeans连接数据库，它适用于我。

祝你好运。

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