tomcat錯誤配置過濾器從web.xml獲得空值

我在 tomcat 服務器的 web.xml 中配置了一些過濾器（如下所示），這些過濾器在我們使用 log4j1.x 之前作業正常。

<filter>
    <filter-name>newsession</filter-name>
    <display-name>newsession</display-name>
    <description>newsession</description>
    <filter-class>com.demo.custom.filter.NewSession</filter-class>
    <init-param>
        <param-name>DomainName</param-name>
        <param-value>.testlab.com</param-value>
    </init-param>
    <init-param>
        <param-name>DomConfigFile</param-name>
        <param-value>/opt/tomcat/webapp/demoapp/WEB-INF/classes/NAM_log4j.xml</param-value>
    </init-param>
    <init-param>
        <param-name>customPropFile</param-name>
        <param-value>/opt/tomcat/webapp/demoapp/WEB-INF/classes/custom_resources.properties</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>newsession</filter-name>
    <url-pattern>/idff/sso</url-pattern>
</filter-mapping>

但是現在當我從 log4j1.x 移動到 log4j2.x 之后，當我們啟動 tomcat 服務時，我們在日志中收到以下錯誤。如果我再次放置“log4j-1.2.15.jar”檔案，它作業正常。但是現在我們在 log4j2.x 上，所以我們不能使用舊的 log4j1.x。

ERROR com.demo.custom.filter.NewSession - No transformation given
ERROR com.demo.custom.filter.NewSession - domConfigFile got null from web.xml, setting hardcoded value
ERROR com.demo.custom.filter.NewSession - custom_resources got null from web.xml, setting hardcoded value
main ERROR Error processing element category ([Configuration: null]): CLASS_NOT_FOUND
main ERROR Unknown object "root" of type org.apache.logging.log4j.core.config.LoggerConfig is ignored: try nesting it inside one of: ["Appenders", "Loggers", "Properties", "Scripts", "CustomLevels"]

下面給出了我的 Java 代碼，我只粘貼了我試圖初始化 servlet 過濾器的代碼。

package com.demo.custom.filter;

import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;

@WebFilter({ "/NewSession" })
public class NewSession implements Filter {
    static class FilteredRequest extends HttpServletRequestWrapper {
        public FilteredRequest(ServletRequest request) {
            super((HttpServletRequest)request);
        }

        public String getParameter(String paramName) {
            String value = super.getParameter(paramName);
            *********************************************
            return value;
        }

        public static String decryptValue(String value){
            String decryptvalue = null;
            ********************************************
            return decryptvalue;
        }
    }

    private static String domainName = null;
    private static String domConfigFile=null;
    private static Logger myLogger = LogManager.getLogger(NewSession.class);
    private String custom_resources;

    public void init(FilterConfig fConfig) throws ServletException {
        try{
            domainName = fConfig.getInitParameter("DomainName");
            domConfigFile=fConfig.getInitParameter("DomConfigFile");
            custom_resources=fConfig.getInitParameter("customPropFile");
        }catch(Exception e){
            myLogger.error(e.getMessage());
        }
        if(domainName == null){
            domainName = ".testlab.com";
        }
        if(domConfigFile==null){
            myLogger.error("domConfigFile got null from web.xml, setting hardcoded value");
            domConfigFile = "/opt/tomcat/webapp/demoapp/WEB-INF/classes/NAM_log4j.xml";
        }
        if(custom_resources==null){
            myLogger.error("custom_resources got null from web.xml, setting hardcoded value");
            nidp_custom_resources = "/opt/tomcat/webapp/demoapp/WEB-INF/classes/custom_resources.properties";
        }
    }
}

請幫助我。我正在使用 tomcat 9 和 log4j v2.17.1。

uj5u.com熱心網友回復：

我的問題通過執行以下更改 TEST_log4j.xml 檔案得到解決，如下所示。

<Configuration>
    <Appenders>
        <Console name="STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{MM/dd HH:mm:ss} %-5p 0.30c %x - %m\n"/>
        </Console>
        <RollingFile name="RollingFile" fileName="/opt/tomcat/logs/MyCustomClassLogs.log" filePattern="/opt/tomcat/logs/MyCustomClassLogs.log-%i">
            <PatternLayout>
                <pattern>%d{MM/dd HH:mm:ss} %-5p %30.30c %x - %m\n</pattern>
            </PatternLayout>
            <Policies>
                <SizeBasedTriggeringPolicy size="5 MB" />
            </Policies>
            <DefaultRolloverStrategy max="5"/>
        </RollingFile>
        <RollingFile name="ResetClass" fileName="/opt/tomcat/logs/resetTrace.log" filePattern="/opt/tomcat/logs/resetTrace.log-%i">
            <PatternLayout>
                <pattern>%d{MM/dd HH:mm:ss} %-5p %30.30c %x - %m\n</pattern>
            </PatternLayout>
            <Policies>
                <SizeBasedTriggeringPolicy size="5 MB" />
            </Policies>
            <DefaultRolloverStrategy max="5"/>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Logger name="com.demo.custom.filter.ResetClass" level="TRACE">
            <AppenderRef ref="ResetClass"/>
        </Logger>
        <Logger name="com.demo.custom.test.MyCustomClass" level="TRACE">
            <AppenderRef ref="RollingFile"/>
        </Logger>
        <Root level="error">
            <AppenderRef ref="STDOUT"/>
        </Root>
    </Loggers>
</Configuration>

uj5u.com熱心網友回復：

您在標題“domConfigFile got null from web.xml, setting hardcoded value”中參考的錯誤訊息是由@WebFilter您的過濾器類引起的。此注釋注冊您的過濾器的第二個實體，其配置為空（和空映射）。

如果您想要過濾器的單個實體，請添加name="newsession"到您的@WebFilter注釋或使用完全限定的類名 ( com.demo.custom.filter.NewSession) 作為過濾器名稱web.xml。

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