Java运行时不支持编码'UTF-8'

Whenever I start our Apache Felix (OSGi) based application under SUN Java ( build 1.6.0_10-rc2-b32 and other 1.6.x builds) I see the following message output on the console (usually under Ubuntu 8.4):

每当我在SUN Java（构建1.6.0_10-rc2-b32和其他1.6.x版本）下启动基于Apache Felix（OSGi）的应用程序时，我在控制台上看到以下消息输出（通常在Ubuntu 8.4下）：

Warning: The encoding 'UTF-8' is not supported by the Java runtime.

警告：Java运行时不支持编码'UTF-8'。

I've seen this message display occasionally when running both Tomcat and Resin as well. If java supports unicode and UTF-8, what causes this message? I've yet to find any reference, or answer to this anywhere else.

在运行Tomcat和Resin时，我偶尔也会看到此消息显示。如果java支持unicode和UTF-8，导致此消息的原因是什么？我还没有找到任何参考，或者在其他地方找到答案。

6 个解决方案

#1

According the documentation "Every implementation of the Java platform is required to support the following standard charsets... US-ASCII, ISO-8859-1, UTF-8, UTF-16BE, UTF-16LE, UTF-16." So I doubt that Sun have released a build without UTF-8 support.

根据文档“Java平台的每个实现都需要支持以下标准字符集... US-ASCII，ISO-8859-1，UTF-8，UTF-16BE，UTF-16LE，UTF-16。”所以我怀疑Sun发布了没有UTF-8支持的版本。

The actual error message appears to be from here, which is part of the Xerces XML parser. I imagine it is the XML parser where the problem is occurring.

实际的错误消息似乎来自此处，它是Xerces XML解析器的一部分。我想这是问题发生的XML解析器。

#2

Try the following program:

尝试以下程序：

import java.nio.charset.Charset;

public class TestCharset {
    public static void main(String[] args) {
        System.out.println(Charset.forName("UTF-8"));
    }
}

If this throws an exception, then there is something wrong with your JDK. If it prints "UTF-8" then your JDK is OK, and your application is doing something odd.

如果这会引发异常，那么JDK就会出现问题。如果它打印“UTF-8”，那么你的JDK就可以了，你的应用程序正在做一些奇怪的事情。

If that's the case, run your app under the debugger, and put a breakpoint in http://www.java2s.com/Open-Source/Java-Document/XML/xalan/org/apache/xml/serializer/ToStream.java.htm --that's the place this warning is produced, and step to see why Xalan can't find the encoding.

如果是这种情况，请在调试器下运行您的应用程序，并在http://www.java2s.com/Open-Source/Java-Document/XML/xalan/org/apache/xml/serializer/ToStream.java中添加断点。 .htm - 这就是产生这个警告的地方，并看看为什么Xalan无法找到编码。

#3

Most probably someone put a catch() expecting to have only unsupported encoding exceptions, so he used the appropriate message. But he has used too wide exception specification (e.g. catch( Exception ex ) ), so when at runtime he's got something else (non-valid XML, NPE, ... ) the message became misleading.

很可能有人把catch（）期望只有不受支持的编码异常，所以他使用了相应的消息。但是他使用了太宽泛的异常规范（例如catch（Exception ex）），因此在运行时他还有其他东西（无效的XML，NPE，......），这些消息会产生误导。

#4

Try a different (stable release) JVM. I had this problem once and it turned out that the machine was running a beta version JVM that indeed did not support UTF-8, contrary to the requirement in the API docs.

尝试使用其他（稳定版本）JVM。我曾经遇到过这个问题，事实证明该机器运行的测试版JVM确实不支持UTF-8，这与API文档中的要求相反。

#5

It should be "UTF8", without the dash.

它应该是“UTF8”，没有破折号。

#6

If you are getting this message when using a Transformer, try to specify the TransformerFactory:

如果您在使用Transformer时收到此消息，请尝试指定TransformerFactory：

link

链接

#1