java.lang.IllegalArgumentException: Invalid character (CR or LF) found in method name

1、错误描述

九月 13, 2017 8:53:24 下午 org.apache.coyote.http11.AbstractHttp11Processor process
信息: Error parsing HTTP request header
 Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character (CR or LF) found in method name
	at org.apache.coyote.http11.InternalInputBuffer.parseRequestLine(InternalInputBuffer.java:131)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:992)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
九月 13, 2017 8:53:34 下午 org.apache.coyote.http11.AbstractHttp11Processor process
信息: Error parsing HTTP request header
 Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character (CR or LF) found in method name
	at org.apache.coyote.http11.InternalInputBuffer.parseRequestLine(InternalInputBuffer.java:131)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:992)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
九月 13, 2017 8:53:44 下午 org.apache.coyote.http11.AbstractHttp11Processor process
信息: Error parsing HTTP request header
 Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character (CR or LF) found in method name
	at org.apache.coyote.http11.InternalInputBuffer.parseRequestLine(InternalInputBuffer.java:131)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:992)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
九月 13, 2017 8:53:54 下午 org.apache.coyote.http11.AbstractHttp11Processor process
信息: Error parsing HTTP request header
 Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character (CR or LF) found in method name
	at org.apache.coyote.http11.InternalInputBuffer.parseRequestLine(InternalInputBuffer.java:131)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:992)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

2、错误原因

（1）由这句“ Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level”，查看资料有显示是Tomcat的header缓冲区大小不够，需要修改server.xml中的maxHttpHeaderSize属性值

（2）由“ Invalid character (CR or LF) found in method name”提示可知，是因为方法名中出现不合法的字符

3、解决办法

（1）针对第一个原因，我修改了maxHttpHeaderSize值，发现这个问题还是出现

（2）检查代码发现，还是方法名带有不合法字符导致