小编Ani*_*kur的帖子

整个代码都很复杂,所以我直接说到了这一点.代码如下

SSLContext ctx = SSLContext.getInstance("TLS");

如果你读了getInstance(字符串协议)方法的文档,它说

This method traverses the list of registered security Providers, starting
with the most preferred Provider. A new SSLContext object encapsulating
the SSLContextSpi implementation from the first Provider that supports the
specified protocol is returned.

Note that the list of registered providers may be retrieved via the
Security.getProviders() method.

For me Security.getProviders() method gives following providers

Now I have verified that "TLS" protocol is in com.sun.net.ssl.internal.ssl.Provider (index 2 ) and is always selected. …

我正在使用curl发出POST请求,如下所示

curl -H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-X POST \
-d '{ "name": "PhoneName", "description": "Phone Description!", "details": { "imeiNumber": "123456789123456", "phoneNumber": "9999999999"}}' \
-k \
http://test.domain.com/myTestServer/devices

但是在servlet中我无法获得任何发布的数据.

public void devices(HttpServletRequest request, HttpServletResponse response) throws IOException {

    System.out.println("Got Request for devices");
    System.out.println("Request is : "+ request);
    System.out.println("Name : " + request.getParameter("name"));   //gives null
    System.out.println("description : " + request.getParameter("description")); //gives null
    Enumeration<String> paramNames = request.getParameterNames();   //Empty Enumeration
    while(paramNames.hasMoreElements()){
        String paramName = paramNames.nextElement();
        System.out.println(paramName + " : " + …

AFAIK当Java自动将原始类型转换为包装类对象而不是其被称为自动装箱时,因为原语被装入包装类.

也是

int test = 3;
String str = String.valueOf(test);

算作自动装箱？

有理由问？

我最近遇到了这个问题.我认为是java 5中引入的自动装箱的原因(Java 4中没有).

当JVM崩溃时,将在工作目录中创建堆转储文件(hs_err_pidXXXX.log).我想知道谁创建了这个文件.JVM崩溃意味着它已异常终止.所以它肯定不会创建这个文件.那么这个文件是如何创建的？

我们也可以控制此文件中显示的信息.如果我想在一个文件(hs_err_pidXXXX.log)中同时进行线程转储和堆转储,是否可能？如果有,怎么样？基本上我的优先事项是识别导致JVM崩溃并将其存储在创建的堆转储文件中的函数(或堆栈跟踪).

如果我这样做args.length();是显示编译错误,因为args.length工作正常.

但如果它不是例如的命令行参数.String str = "hello"; 在这str.length不起作用,但str.length()工作正常.

请帮忙!