Java EE 5 will release

The Advantages of the Java EE 5 Platform: A Conversation with Distinguished Engineer Bill Shannon
http://java.sun.com/developer/technicalArticles/Interviews/shannon_qa.html?feed=JSC

"There are so many ways we've made life simpler for developers, it's hard to know where to start."

"If you were scared off of J2EE because it seemed too complex, it's time to take another look."

you no longer need to use deployment descriptors;

Previously, to create a web service, you needed to write a Java interface that describes the web service API, a Java class that implements the web service, a deployment descriptor that tells the container about the web service, and a configuration file that tells the web service runtime how to map Java classes to web service operations. Much of this was boilerplate that changed little from application to application. In Java EE 5 all of this can be done by writing a single Java source file -- the class that implements the web service. The rest is taken care of for you by the container, based on annotations you include in your source code, and based on default rules for what to do when no annotations are present.

Enterprise JavaBeans 3.0 and the Java Persistence API;

JavaServer Faces and Web Application Design;

Java EE 5 and Service-Oriented Architecture;

The PE application server is suitable for development and small scale deployment. Sun will also make available an EE (Enterprise Edition) version of the application server that will include more advanced features such as five nines availability.

The PE application server, built from the [b]GlassFish[/b] code, is the application server included in the Java EE 5 SDK.
There are many ways to contribute to the future of Java EE
Perhaps the best approach is to go to the [url=http://java.sun.com/javaee]Java EE hub page[/url], read the tutorial, download the SDK, try it out, and send us feedback!
Developers who are interested in understanding "how it all works" will definitely want to explore GlassFish.


It's hard to name just one thing. Certainly the thing that pervades all of Java EE 5 and is key to the simplified programming model is annotations. We've used annotations to make it much easier to deal with persistence, web services, transactions, security, and all the other powerful capabilities of Java EE. We expect that developers will quickly understand and embrace the annotation approach to application development and will then move on to explore the improved persistence and web service capabilities in Java EE 5.
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<think>好的,我需要帮助用户解决Maven运行时因调用受限方法java.lang.System::load而产生的警告问题,具体涉及Maven 3.9.9、jansi-2.4.1,并在Windows 11上找到启用本地访问的解决方案。首先,我需要理解这个问题的背景。 用户提到的警告可能与Java模块系统的限制有关。从Java 9开始,引入了模块化系统,限制了某些内部API的访问,比如使用反射或直接调用系统方法。当第三方库(如jansi)尝试调用受限方法时,会触发警告。Jansi库通常用于处理控制台颜色输出,可能需要本地库加载,因此会调用System::load方法。 接下来,我需要查阅相关的解决方案。根据用户提供的引用,特别是引用[^1]和[^4],可能与类路径或依赖项配置有关。但用户的问题更具体于模块系统的访问限制。因此,可能需要通过添加JVM参数来允许这些访问。 在Java中,可以使用--add-opens参数来开放特定模块的包,以便反射访问。例如,允许jansi访问java.lang模块的包。此外,启用本地访问可能需要--enable-native-access参数。用户使用的Maven版本是3.9.9,可能需要调整MAVEN_OPTS环境变量来包含这些参数。 另外,检查jansi的版本是否有更新,可能新版本已经解决了这个问题。当前使用的是2.4.1,可以看看是否有更新的版本,比如2.4.2或更高,可能已经适配了新的Java版本。 还需要考虑Maven的配置,比如在settings.xml或pom.xml中配置插件参数,或者升级Maven插件到支持新Java版本的版本。同时,用户的环境变量是否正确设置,如JAVA_HOME指向正确的JDK版本,避免使用过时的JDK。 可能的解决方案步骤包括: 1. 在MAVEN_OPTS中添加--add-opens和--enable-native-access参数。 2. 升级jansi库到最新版本。 3. 更新Maven插件配置,确保兼容性。 4. 检查JDK版本,确保使用的是兼容的版本(如JDK 17或更高,并正确配置)。 需要验证这些步骤是否有效,例如,设置MAVEN_OPTS为: export MAVEN_OPTS="--add-opens java.base/java.lang=ALL-UNNAMED --enable-native-access=jansi" 在Windows上,可能需要通过系统环境变量设置或在命令行中设置。此外,用户的项目配置中可能需要显式声明jansi的依赖版本,确保没有版本冲突。 如果用户遇到类加载问题(如引用中的错误),可能需要清理Maven本地仓库缓存,重新下载依赖,或者更新项目配置(如引用[^2]提到的右键更新Maven项目)。 总结,解决方案应围绕调整JVM参数以允许访问受限方法,升级相关库版本,以及确保环境配置正确。</think>### 解决Maven调用`System::load`的警告问题 #### 1. **问题背景** 当使用Maven 3.9.9时,警告可能由以下原因触发: - **Jansi库(2.4.1)**依赖`System::load`加载本地库以支持控制台颜色渲染。 - Java模块系统(Java 9+)默认限制对某些方法的访问,导致警告。 #### 2. **解决方案** ##### **步骤1:添加JVM参数允许访问受限方法** 通过`MAVEN_OPTS`环境变量添加以下参数: ```shell # Windows (PowerShell或CMD) set MAVEN_OPTS="--add-opens java.base/java.lang=ALL-UNNAMED --enable-native-access=jansi" # 执行Maven命令 mvn clean install ``` - `--add-opens`: 允许jansi访问`java.lang`模块的包。 - `--enable-native-access`: 启用本地库加载(Java 17+引入)。 ##### **步骤2:升级Jansi版本** 检查是否可升级到更高版本(如2.4.2+),部分版本已适配Java模块限制: ```xml <!-- pom.xml中显式指定jansi版本 --> <dependency> <groupId>org.fusesource.jansi</groupId> <artifactId>jansi</artifactId> <version>2.4.1</version> <!-- 替换为最新版本 --> </dependency> ``` ##### **步骤3:验证JDK版本** 确保使用**JDK 17或更高版本**,并正确配置环境变量: ```shell # 检查Java版本 java -version # 设置JAVA_HOME(Windows示例) set JAVA_HOME="C:\Program Files\Java\jdk-17" ``` ##### **步骤4:清理Maven缓存** 若仍报错,清理本地仓库缓存: ```shell # 删除本地仓库中的jansi目录 rm -rf ~/.m2/repository/org/fusesource/jansi # 重新构建项目 mvn clean install ``` #### 3. **其他配置调整** - **IDE配置**:在IntelliJ中检查Maven设置(`File -> Settings -> Build Tools -> Maven`),确保使用正确的JDK[^3]。 - **项目更新**:右键项目选择`Maven -> Update Project`,强制同步依赖[^2]。 ---
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