JDK10-JSE,OracleJDKMigrationGuid-23.pdf资源-CSDN文库

需积分: 5 181 浏览量 2023-08-08 08:47:32 上传评论收藏 207KB PDF 举报

Java 平台标准版 Oracle JDK 迁移指南 Java 平台标准版（Java Platform, Standard Edition）是 Oracle 公司推出的 Java 开发环境，提供了完整的 Java 开发解决方案。Oracle JDK 迁移指南是帮助开发者将现有的 Java 应用程序从 JDK 8 或更早的版本迁移到 JDK 10 的指南。 JDK 10 的发布引入了一些二进制、源代码和行为不兼容问题，这些问题可能会影响到现有的 Java 应用程序的正常运行。为了帮助开发者成功迁移到 JDK 10，本指南提供了一些实用的建议和步骤。在迁移到 JDK 10 之前，开发者需要了解 JDK 10 中的一些变化，例如新的版本字符串scheme、Runtime 访问警告、JDK/JRE 映像的变化、已删除或更改的 API、模块与 Java EE 的关系、部署、安全更新、垃圾回收的变化、已删除的工具和组件、macOS 特定的功能等。另外，本指南还提供了一些实用的建议，帮助开发者避免将来的问题。例如，在迁移到 JDK 10 之前，开发者需要下载 JDK 10、运行程序之前编译、更新第三方库等。 JDK 10 中的一些变化： * 新的版本字符串scheme：JDK 10 引入了新的版本字符串scheme，开发者需要了解这个变化，以便正确地使用版本字符串。 * Runtime 访问警告：JDK 10 中引入了 Runtime 访问警告，开发者需要了解这些警告，以便避免可能的问题。 * JDK/JRE 映像的变化：JDK 10 中的 JDK/JRE 映像发生了变化，开发者需要了解这些变化，以便正确地使用 JDK/JRE。 * 已删除或更改的 API：JDK 10 中的一些 API 已经被删除或更改，开发者需要了解这些变化，以便正确地使用 API。 * 模块与 Java EE 的关系：JDK 10 中的模块与 Java EE 之间的关系发生了变化，开发者需要了解这些变化，以便正确地使用模块。 * 部署：JDK 10 中的部署机制发生了变化，开发者需要了解这些变化，以便正确地部署应用程序。 * 安全更新：JDK 10 中的安全更新机制发生了变化，开发者需要了解这些变化，以便避免可能的问题。 * 垃圾回收的变化：JDK 10 中的垃圾回收机制发生了变化，开发者需要了解这些变化，以便正确地使用垃圾回收。 * 已删除的工具和组件：JDK 10 中的一些工具和组件已经被删除，开发者需要了解这些变化，以便避免可能的问题。 * macOS 特定的功能：JDK 10 中的一些 macOS 特定的功能已经被删除，开发者需要了解这些变化，以便避免可能的问题。本指南为开发者提供了一份详细的迁移指南，帮助他们成功迁移到 JDK 10。

资源推荐

资源详情

资源评论

Java Platform, Standard Edition

Oracle JDK Migration Guide

Release 10

E91271-01

March 2018

Migrating to JDK 10 from JDK 8

The purpose of this guide is to help you identify potential issues and give you

suggestions on how to proceed as you migrate your existing Java application from

JDK 8, or earlier version of the JDK, to JDK 10. This guide is not significantly different

than the JDK 9 Migration Guide.

Every new Java SE release introduces some binary, source, and behavioral

incompatibilities with previous releases. The modularization of the Java SE Platform

that happened in JDK 9 brought many benefits, but also many changes. Code that

uses only official Java SE Platform APIs and supported JDK-specific APIs should

continue to work without change. Code that uses JDK-internal APIs should continue to

run but should be migrated to use external APIs.

To migrate your application, start by following the steps listed in Prepare for Migration.

Then, look at the list of changes that you may encounter as you run your application.

• New Version-String Scheme

• Understanding Runtime Access Warnings

• Changes to the Installed JDK/JRE Image

• Removed or Changed APIs

• Modules Shared with Java EE Not Resolved by Default

• Deployment

• Security Updates

• Changes to Garbage Collection

• Removed Tools and Components

• Removed macOS-Specific Features

Finally, when your application is running successfully on JDK 10, review Looking

Forward, which will help you avoid problems with future releases.

Related Links

This guide focuses on changes required to make your code run on JDK 10.

Even if your program appears to run successfully, you should complete the rest of the

steps in this guide and review the list of issues.

Update Third-Party Libraries

For every tool and third-party library that you use, you may need to have an updated

version that supports at least JDK 9.

Check the websites for your third-party libraries and your tool vendors for a version of

each library or tool that’s designed to work on JDK 9 or 10. If one exists, then

download and install the new version.

If you use Maven or Gradle to build your application, then make sure to upgrade to a

more recent version that supports JDK 9 or 10.

If you use an IDE to develop your applications, then it can help to migrate existing

code. The NetBeans, Eclipse, and IntelliJ IDEs all have versions available that include

JDK 9 or 10 support.

You can see the status of the testing of many Free Open Source Software (FOSS)

projects with OpenJDK builds at Quality Outreach on the OpenJDK wiki.

Compile Your Application if Needed

Compiling your code with the JDK 10 compiler will ease migration to future releases

since the code may depend on APIs and features which have been identified as

problematic. However, it is not strictly necessary.

If you need to compile your code with the JDK 10 compiler then take note of the

following:

• If you use the underscore character ("_") as a one-character identifier in source

code, then your code won’t compile in JDK 10. Its use generates a warning in JDK

8, and an error, starting in JDK 9.

As an example:

static Object _ = new Object();

This code generates the following error message from the compiler:

MyClass.java:2: error: as of release 9, '_' is a keyword, and may not be used as

a legal identifier.

• If you use the

-source

and

-target

options with

javac

, then check the values that

you use.

The supported

-source/-target

values are 10 (the default), 9, 8, 7, and 6 (6 is

deprecated, and a warning is displayed when this value is used).

In JDK 8,

-source

and

-target

values of 1.5/5 and earlier were deprecated and

caused a warning to be generated. In JDK 9 and above, those values cause an

error.

>javac -source 5 -target 5 Sample.java

warning: [options] bootstrap class path not set in conjunction with -source 1.5

error: Source option 1.5 is no longer supported. Use 1.6 or later.

error: Target option 1.5 is no longer supported. Use 1.6 or later.

If possible, use the new

--release

flag instead of the

-source

and

-target

options.

The

--release N

flag is conceptually a macro for:

-source N -target N -bootclasspath $PATH_TO_rt.jar_FOR_RELEASE_N

The valid arguments for the

--release

flag follow the same policy as for

-source

and

-target

, one plus three back.

javac

can recognize and process class files of all previous JDKs, going all the way

back to JDK 1.0.2 class files.

See JEP 182: Policy for Retiring javac -source and -target Options.

• Critical internal JDK APIs such as sun.misc.Unsafe are still accessible in JDK

10, but most of the JDK’s internal APIs are not accessible at compile time. You

may get compilation errors that indicate that your application or its libraries are

dependent on internal APIs.

To identify the dependencies, run the Java Dependency Analysis tool. See Run

jdeps on Your Code. If possible, update your code to use the supported

replacement APIs.

You may use the

--add-exports

option as a temporary workaround to compile

source code with references to JDK internal classes.

• You may see more deprecation warnings than previously. If you see deprecation

with removal warnings, then you should address those to avoid future problems.

• In JDK 9, a number of small changes were made to

javac

to align it with the Java

SE 9 Language Specification.

• You may encounter some source compatibility issues when recompiling.

The JDK 9 Release Notes contains details of changes to the

javac

compiler and

source compatibility issues.

Run jdeps on Your Code

Run the

jdeps

tool on your application to see what packages and classes your

applications and libraries depend on. If you use internal APIs, then

jdeps

may suggest

replacements to help you to update your code.

To look for dependencies on internal JDK APIs, run

jdeps

with the

-jdkinternals

option. For example, if you run

jdeps

on a class that calls

sun.misc.BASE64Encoder

you’ll see:

>jdeps -jdkinternals Sample.class

Sample.class -> JDK removed internal API

Sample -> sun.misc.BASE64Encoder JDK internal API (JDK removed internal API)

Warning: JDK internal APIs are unsupported and private to JDK implementation that are

subject to be removed or changed incompatibly and could break your application.

Please modify your code to eliminate dependency on any JDK internal APIs.

For the most recent update on JDK internal API replacements, please check:

https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool

剩余22页未读，继续阅读

评论收藏

内容反馈

weixin_40191861_zj

粉丝: 86
资源: 1万+

JDK10-JSE ,Oracle JDK Migration Guid-23.pdf

最新资源

JDK10-JSE ,Oracle JDK Migration Guid-23.pdf

JDK9-JSE-Oracle JDK 9 Migration Guide-23.pdf

JDK10-JSE JRockit to HotSpot Migration Guide-30.pdf

JDK9-JSE-JRockit to HotSpot Migration Guide-29.pdf

bcprov-jdk16-143.jar和bcprov-jdk15-135.jar

jdk-8u311-windows-x64.exe

java-jdk1.8-8u361-all-jdk-win-linux

JDK9-JSE-Internationalization Guide-36.pdf

JDK9-JSE-Installation Guide-27.pdf

JDK9-JSE-Core Libraries-38.pdf

JDK9-JSE-Troubleshooting Guide-244.pdf

JDK9-JSE-Javadoc Guide-43.pdf

JDK9-JSE-Deployment Guide-164.pdf

JDK9-JSE-Tools Reference-319.pdf

JDK9-JSE-Java Accessibility Guide-30.pdf

JDK9-JSE-Java Language Updates-3.pdf

bcprov-jdk15to18-1.69.jar

bcprov-jdk16-1.46.jar

JDK9-JSE- Java Management Extensions Guide-245.pdf

JDK9-JSE-Monitoring and Management Guide-67.pdf

更多目录以及详细说明（年份、来源、截图等）

相关实用应用程序（Windows可用）

李飞飞自传 我看见的世界 The World I see

ChatGPT使用总结：150个ChatGPT提示词模板（完整版）

全国计算机二级WPSoffice精选350道选择题题库（含答案）.pdf

技术资料分享ucOS-II入门教程(任哲)很好的技术资料.zip

技术资料分享Ucos_II_中文注释版很好的技术资料.zip

技术资料分享uip_中文资料很好的技术资料.zip

eetop.cn-07-1射频电路设计理论与应用-王子宇 -课后答案1-10章

哈尔滨工业大学-ChatGPT调研报告-2023.3.6-94页.pdf

最新资源

李飞飞自传我看见的世界 The World I see