Tomcat 解决“At least one JAR was scanned for TLDs yet contained no TLDs”问题

今天在部署war包到服务器的时候，突然出现以下错误，之前没有，造成的原因未知。

org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.

这个问题的意思是，在tomcat启动的时候需要扫描你项目中的使用到的jar包，如果有部分的jar包不符合TLD规范的话，会报这个错误。
查询网上发现有一个解决办法完美解决这个问题，只需要在tomca的conf目录的catalina.properties添加一行

tomcat.util.scan.StandardJarScanFilter.jarsToSkip=*.jar

原有的tomcat.util.scan.StandardJarScanFilter.jarsToSkip为：

tomcat.util.scan.StandardJarScanFilter.jarsToSkip=\
annotations-api.jar,\
ant-junit*.jar,\
ant-launcher.jar,\
ant.jar,\
asm-*.jar,\
aspectj*.jar,\
bootstrap.jar,\
catalina-ant.jar,\
catalina-ha.jar,\
catalina-jmx-remote.jar,\
catalina-storeconfig.jar,\
catalina-tribes.jar,\
catalina-ws.jar,\
catalina.jar,\
cglib-*.jar,\
cobertura-*.jar,\
commons-beanutils*.jar,\
commons-codec*.jar,\
commons-collections*.jar,\
commons-daemon.jar,\
commons-dbcp*.jar,\
commons-digester*.jar,\
commons-fileupload*.jar,\
commons-httpclient*.jar,\
commons-io*.jar,\
commons-lang*.jar,\
commons-logging*.jar,\
commons-math*.jar,\
commons-pool*.jar,\
dom4j-*.jar,\
easymock-*.jar,\
ecj-*.jar,\
el-api.jar,\
geronimo-spec-jaxrpc*.jar,\
h2*.jar,\
hamcrest-*.jar,\
hibernate*.jar,\
httpclient*.jar,\
icu4j-*.jar,\
jasper-el.jar,\
jasper.jar,\
jaspic-api.jar,\
jaxb-*.jar,\
jaxen-*.jar,\
jdom-*.jar,\
jetty-*.jar,\
jmx-tools.jar,\
jmx.jar,\
jsp-api.jar,\
jstl.jar,\
jta*.jar,\
junit-*.jar,\
junit.jar,\
log4j*.jar,\
mail*.jar,\
objenesis-*.jar,\
oraclepki.jar,\
oro-*.jar,\
servlet-api-*.jar,\
servlet-api.jar,\
slf4j*.jar,\
taglibs-standard-spec-*.jar,\
tagsoup-*.jar,\
tomcat-api.jar,\
tomcat-coyote.jar,\
tomcat-dbcp.jar,\
tomcat-i18n-en.jar,\
tomcat-i18n-es.jar,\
tomcat-i18n-fr.jar,\
tomcat-i18n-ja.jar,\
tomcat-i18n-ru.jar,\
tomcat-jdbc.jar,\
tomcat-jni.jar,\
tomcat-juli-adapters.jar,\
tomcat-juli.jar,\
tomcat-util-scan.jar,\
tomcat-util.jar,\
tomcat-websocket.jar,\
tools.jar,\
websocket-api.jar,\
wsdl4j*.jar,\
xercesImpl.jar,\
xml-apis.jar,\
xmlParserAPIs-*.jar,\
xmlParserAPIs.jar,\
xom-*.jar

这里可以先把这些备份，以防设置出现问题，可以恢复原有的配置。

修改完之后，需要重启tomcat，然后重新部署服务，亲测问题解决。

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