最近服务器运行一段时间就报错，错误信息如下：

严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@339220f2]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@591c6bfe]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@58f61e66]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@645e82b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@578d6244]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@35a1a7b4]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@80935ee]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@14b3a061]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@1ce64ae5]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$2] (value [com.jfinal.template.io.WriterBuffer$2@65f1092f]) and a value of type [com.jfinal.template.io.CharWriter] (value [com.jfinal.template.io.CharWriter@533f0f35]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
四月 03, 2018 8:36:44 上午 org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
严重: The web application [] created a ThreadLocal with key of type [com.jfinal.template.io.WriterBuffer$3] (value [com.jfinal.template.io.WriterBuffer$3@3eb10a51]) and a value of type [com.jfinal.template.io.FastStringWriter] (value []) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

并且有时Tomcat自动就关闭了，网上搜了一下也没有这种情况的。请问这个是什么问题呢？？？