相关疑难解决方法(0)

使用Maven构建Java 8项目时:

mvn clean package

我收到这条消息:

Java HotSpot(TM)64位服务器VM警告:忽略选项MaxPermSize = 128m; 支持在8.0中删除

如何删除此邮件？

在我的系统上,我无法运行启动进程的简单Java应用程序.我不知道该怎么解决.

你能给我一些如何解决的提示吗？

该计划是:

[root@newton sisma-acquirer]# cat prova.java
import java.io.IOException;

public class prova {

   public static void main(String[] args) throws IOException {
        Runtime.getRuntime().exec("ls");
    }

}

结果是:

[root@newton sisma-acquirer]# javac prova.java && java -cp . prova
Exception in thread "main" java.io.IOException: Cannot run program "ls": java.io.IOException: error=12, Cannot allocate memory
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:474)
        at java.lang.Runtime.exec(Runtime.java:610)
        at java.lang.Runtime.exec(Runtime.java:448)
        at java.lang.Runtime.exec(Runtime.java:345)
        at prova.main(prova.java:6)
Caused by: java.io.IOException: java.io.IOException: error=12, Cannot allocate memory
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
        at java.lang.ProcessImpl.start(ProcessImpl.java:81)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:467)
        ... 4 more

系统配置:

[root@newton sisma-acquirer]# java -version …

我正在尝试为应用程序运行负载测试.为此,我在Ubuntu Vm上使用JMeter(v.2.13),具有60GB Ram和足够的CPU功率.目标是通过WebSocket连接10k用户.

但是在测试运行期间,我在ssh-console上遇到以下错误(大约1.5k到2.5k模拟用户)

OpenJDK 64-Bit Server VM warning: Attempt to protect stack guard pages failed.
OpenJDK 64-Bit Server VM warning: Attempt to deallocate stack guard pages failed.
OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f20ee653000, 12288, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 12288 bytes for committing reserved memory.
# An error report file with more information is saved as: …