Java 14在2020年3月17号正式发布,不久AdoptOpenJDK也跟进了。 JEP 358: Helpful NullPointerExceptions 其中对使用者比较有用的功能是JEP 358: Helpful NullPointerExceptions,即在NullPointerException的message中指明为什么产生了这个NPE。 示例代码如下(需要Java14,并配置运行时参数-XX:+ShowCodeDetailsInExceptionMessa...
However, since Java 14 with Helpful NullPointerExceptions the message contains a more precise reason: Exception in thread "main" java.lang.NullPointerException: Cannot invoke "org.w3c.dom.Node.getChildNodes()" because the return value of "org.w3c.dom.NodeList.item(int)" is null at Main.proc...
4.Java 8之后的那些新特性 (四) :网络请求 Java Http Client 5.Java 8之后的那些新特性 (五) :Helpful NullPointerExceptions 啰嗦的数据类 如果你在Java的代码项目中,或多或少一定会接触这些类的概念 • DTO (data transfer object) 数据传输对象 • VO (Value Object) 值对象 • POJO (Plain Old ...
"com.developlee.java14.helpfulnullpointerexceptions.HelpfulNullPointerException$Employee.getName()"because"employee"isnull 相反,在没有额外调试信息的情况下,JVM 只提供它在详细消息中所知道的变量: 代码语言:javascript 复制 Cannot invoke"com.developlee.java14.helpfulnullpointerexceptions.HelpfulNullPointerExcep...
Very helpful4% Somewhat helpful53% Neutral29% Less than helpful8% Not at all helpful Unsure3% 418PARTICIPANTS 3.3k views UpvoteCommentSaveShare Content you might like Does your contract lifecycle management tool deliver on their AI/ML promises?
{"role": "system", "content": "You are a helpful assistant."}, {"role": "user", "content": "Who won the world series in 2020?"}, {"role": "assistant", "content": "The Los Angeles Dodgers won the World Series in 2020."}, ...
publicclassHelpfulNullPointerException { publicstaticvoidmain(String[] args) { Employee e =null; System.out.println(e.getName()); } } classEmployee { Long id; String name; publicLong getId() { returnid; } publicvoidsetId(Long id) { ...
Java SE Technical Documentation Java SE Components Documentation Java Embedded Java ME Embedded is designed for resource-constrained devices like wireless modules for M2M, industrial control, smart-grid infrastructure, environmental sensors and tracking, and more. ...
// Java 11Exceptioninthread"main"java.lang.NullPointerExceptionatcom.rg.java17.HelpfulNullPointerExceptions.main(HelpfulNullPointerExceptions.java:13)// Java 17Exceptioninthread"main"java.lang.NullPointerException:Cannotinvoke"com.rg.java17.Grape.getColor()"becausethereturnvalueof"java.util.HashMap....
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