今天在部署war包到服務器的時候，突然出現以下錯誤，之前沒有，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.

這個問題的意思是，在tomcat啟動的時候需要掃描你項目中的使用到的jar包，如果有部分的jar包不符合TLD規范的話，會報這個錯誤。
查詢網上發現有一個解決辦法完美解決這個問題，只需要在tomca的conf目錄的catalina.properties添加一行

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

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

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 這里可以先把這些備份，以防設置出現問題，可以恢復原有的配置。

修改完之后，需要重啟tomcat，然后重新部署服務，親測問題解決。

總結

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