我收到了这个错误

java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version；类=map/CareMonths，偏移量=6

我的 Eclipse 的 Java 编译器设置为 1.6，而我在 C:\Program Files 中安装的 Java SDK 是 1.6.0，但安装时仍然出现此错误我的应用程序到 Webshere Application Server V7。

offset=6 是什么意思？我想使用 Java 6 进行编译，Websphere 7 支持 Java 6。

我确实看到安装服务器的 IBM 目录中的 JDK 是 Java 7。这是造成这种情况的原因吗？ ....但我的工作区的 Eclipse 编译器再次设置为 Java 1.6.

最佳答案

WebSphere Application Server V7 确实支持 Java Platform, Standard Edition (Java SE) 6(请参阅网络部​​署(所有操作系统)版本 7.0 信息中心中的 Specifications and API documentation)，它从 the release V8.5 when Java 7 has been supported 开始。

我找不到 Java 6 SDK 文档，只能查阅 IBM JVM Messages 中的 Java 7 Windows documentation 。唉，我在文档中也找不到错误消息。

由于 java.lang.UnsupportedClassVersionError 是“当 Java 虚拟机尝试读取类文件并确定文件中的主要和次要版本号不受支持时抛出。”，您遇到了以下问题使用比运行时环境支持的 Java 版本更新的 Java 构建应用程序，即 WebSphere Application Server 7.0。

我可能记错了，但我认为消息中的 offset=6 是为了让您知道是什么位置导致了不兼容问题的发生。它对你、我和许多其他人都无关紧要，但有些人可能会觉得它很有用，尤其是。当他们自己生成字节码时。

运行 versionInfo 命令查看 WebSphere Application Server V7 的Installed Features，例如

C:\IBM\WebSphere\AppServer>.\bin\versionInfo.bat
WVER0010I: Copyright (c) IBM Corporation 2002, 2005, 2008; All rights reserved.
WVER0012I: VersionInfo reporter version 1.15.1.47, dated 10/18/11

--------------------------------------------------------------------------------
IBM WebSphere Product Installation Status Report
--------------------------------------------------------------------------------

Report at date and time February 19, 2013 8:07:20 AM EST

Installation
--------------------------------------------------------------------------------
Product Directory        C:\IBM\WebSphere\AppServer
Version Directory        C:\IBM\WebSphere\AppServer\properties\version
DTD Directory            C:\IBM\WebSphere\AppServer\properties\version\dtd
Log Directory            C:\ProgramData\IBM\Installation Manager\logs

Product List
--------------------------------------------------------------------------------
BPMPC                    installed
ND                       installed
WBM                      installed

Installed Product
--------------------------------------------------------------------------------
Name                  IBM Business Process Manager Advanced V8.0
Version               8.0.1.0
ID                    BPMPC
Build Level           20121102-1733
Build Date            11/2/12
Package               com.ibm.bpm.ADV.V80_8.0.1000.20121102_2136
Architecture          x86-64 (64 bit)
Installed Features    Non-production
                      Business Process Manager Advanced - Client (always installed)
Optional Languages    German
                      Russian
                      Korean
                      Brazilian Portuguese
                      Italian
                      French
                      Hungarian
                      Simplified Chinese
                      Spanish
                      Czech
                      Traditional Chinese
                      Japanese
                      Polish
                      Romanian

Installed Product
--------------------------------------------------------------------------------
Name                  IBM WebSphere Application Server Network Deployment
Version               8.0.0.5
ID                    ND
Build Level           cf051243.01
Build Date            10/22/12
Package               com.ibm.websphere.ND.v80_8.0.5.20121022_1902
Architecture          x86-64 (64 bit)
Installed Features    IBM 64-bit SDK for Java, Version 6
                      EJBDeploy tool for pre-EJB 3.0 modules
                      Embeddable EJB container
                      Sample applications
                      Stand-alone thin clients and resource adapters
Optional Languages    German
                      Russian
                      Korean
                      Brazilian Portuguese
                      Italian
                      French
                      Hungarian
                      Simplified Chinese
                      Spanish
                      Czech
                      Traditional Chinese
                      Japanese
                      Polish
                      Romanian

Installed Product
--------------------------------------------------------------------------------
Name                  IBM Business Monitor
Version               8.0.1.0
ID                    WBM
Build Level           20121102-1733
Build Date            11/2/12
Package               com.ibm.websphere.MON.V80_8.0.1000.20121102_2222
Architecture          x86-64 (64 bit)
Optional Languages    German
                      Russian
                      Korean
                      Brazilian Portuguese
                      Italian
                      French
                      Hungarian
                      Simplified Chinese
                      Spanish
                      Czech
                      Traditional Chinese
                      Japanese
                      Polish
                      Romanian

--------------------------------------------------------------------------------
End Installation Status Report
--------------------------------------------------------------------------------

关于java - UnsupportedClassVersionError : JVMCFRE003 bad major version in WebSphere AS 7，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14926402/