ArrayIndexOutOfBoundsException: 16384

最近突然发现自己的系统在输出字符串的时候出现下标越界的错误，如下：

java.lang.ArrayIndexOutOfBoundsException: 16384

at com.caucho.vfs.i18n.UTF8Writer.write(UTF8Writer.java:143)

at com.caucho.server.connection.ToByteResponseStream.flushCharBuffer(ToByteResponseStream.java:476)

at com.caucho.server.connection.ToByteResponseStream.nextCharBuffer(ToByteResponseStream.java:461)

at com.caucho.server.connection.ResponseWriter.write(ResponseWriter.java:144)

at com.caucho.vfs.AbstractPrintWriter.print(AbstractPrintWriter.java:210)

at cn.joy.action.BaseAction.outPrint(BaseAction.java:207)

at cn.joy.action.CommentsAction.commentsList(CommentsAction.java:70)

跟踪代码发现输出字符串的时候用的PrintWriter 对的print方法

HttpServletResponse response = ServletActionContext.getResponse();
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = null;
		try {
			out = response.getWriter();
		} catch (IOException e) {

		}
		String result = message;

		if (out != null) {
			out.print(result);
			out.flush();
			out.close();
		}

最后测试发现当web服务器为tomcat的时候该问题不会出现，所以自己推断该问题与不同web服务器对PrintWriter的实现不同有关系，所以最后采用直接输出字节流的形式解决该问题：

HttpServletResponse response = ServletActionContext.getResponse();
		//response.setContentType("text/html;charset=utf-8");
		response.setContentType("application/json;charset=utf-8");
		ServletOutputStream out = null;
		try {
			//out = response.getWriter();
			response.setCharacterEncoding("utf-8");
			out = response.getOutputStream();
			if (out != null){
				out.write(message.getBytes("utf-8"));
				out.flush();
			}
		} catch (Exception e) {
            log.error(e.getMessage(), e);
		}finally{
			try {
				if (out != null) {
				    out.close();
				}
			} catch (IOException e) {
				log.error(e.getMessage(), e);
			}
		}

希望对大家有帮助

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