错误代码如下，请大神解答
依赖包如下：
<groupId>com.oa</groupId>
<artifactId>oa-electric</artifactId>
<version>1.0.0</version>
<packaging>war</packaging>
<name>pm</name>
<description>Demo project for Spring Boot</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>8</java.version>
<!-- <tomcat.version>7.0.61</tomcat.version>-->
</properties>
<dependencies>
<dependency>
<groupId>org.activiti</groupId>
<artifactId>activiti-spring-boot-starter</artifactId>
<version>7.1.0.M4</version>
</dependency>
<dependency>
<groupId>org.activiti.dependencies</groupId>
<artifactId>activiti-dependencies</artifactId>
<version>7.1.0.M4</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-annotations-api</artifactId>
<version>9.0.37</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>el-impl</artifactId>
<version>2.2</version>
</dependency>
<!-- mysql数据库 -->
<!-- <dependency>-->
<!-- <groupId>mysql</groupId>-->
<!-- <artifactId>mysql-connector-java</artifactId>-->
<!-- <scope>8.0.15</scope>-->
<!-- </dependency>-->
<!-- sql server数据库 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.20</version>
</dependency>
<!-- <dependency>-->
<!-- <groupId>com.microsoft.sqlserver</groupId>-->
<!-- <artifactId>mssql-jdbc</artifactId>-->
<!-- <version>6.4.0.jre8</version>-->
<!-- </dependency>-->
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>3.0</version>
</dependency>
<!-- 测试 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Mybatis-Plus-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.0.2</version>
</dependency>
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
</dependency>
<!-- <dependency>-->
<!-- <groupId>com.baomidou</groupId>-->
<!-- <artifactId>mybatis-plus</artifactId>-->
<!-- <version>3.3.2</version>-->
<!-- </dependency>-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.18</version>
</dependency>
<!-- commons-->
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.2</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.10</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<!-- <dependency>-->
<!-- <groupId>commons-fileupload</groupId>-->
<!-- <artifactId>commons-fileupload</artifactId>-->
<!-- <version>1.3.3</version>-->
<!-- </dependency>-->
<!-- email -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-email</artifactId>
<version>1.4</version>
</dependency>
<!-- <dependency>-->
<!-- <groupId>javax.mail</groupId>-->
<!-- <artifactId>mail</artifactId>-->
<!-- <version>1.4.7</version>-->
<!-- </dependency>-->
<!-- redis-->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.8.1</version>
<type>jar</type>
</dependency>
<!-- lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!-- guava-->
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-guava</artifactId>
<version>2.10.3</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.12</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.12</version>
</dependency>
<!-- fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-reflect</artifactId>
<version>1.3.70</version>
</dependency>
<!-- jsp配置-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<version>7.0.61</version>
</dependency>
<!-- junit 使用Rule-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.10.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.4.3.Final</version>
</dependency>
<!--excel导出，解析-->
<!-- <dependency>-->
<!-- <groupId>org.apache.poi</groupId>-->
<!-- <artifactId>poi</artifactId>-->
<!-- <version>4.1.2</version>-->
<!-- </dependency>-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.11</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ss</artifactId>
<version>3.11</version>
</dependency>
<dependency>
<groupId>jxl</groupId>
<artifactId>jxl</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.apache</groupId>
<artifactId>xmlbeans</artifactId>
<version>2.17</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<!--打包时跳过单元测试-->
<skipTests>true</skipTests>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<verbose>true</verbose>
<fork>true</fork>
<executable>${JAVA8_HOME}/bin/javac</executable>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<!--<!– <version>${maven-compiler-plugin.version}</version>–>-->
<!-- <configuration>-->
<!-- <release>${java.version}</release>-->
<!-- <showDeprecation>true</showDeprecation>-->
<!-- <showWarnings>true</showWarnings>-->
<!-- <optimize>true</optimize>-->
<!-- </configuration>-->
<!-- </plugin>-->
</plugins>
</build>
<repositories>
<repository>
<id>alfresco</id>
<name>Activiti Releases</name>
<url>https://artifacts.alfresco.com/nexus/content/repositories/activiti-releases/</url>
<releases>
<enabled>true</enabled>
</releases>
</repository>
</repositories>
错误如下：
2020-09-15 17:13:18.842 INFO 15824 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-09-15 17:13:18.859 INFO 15824 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 16 ms
2020-09-15 17:13:34.727 ERROR 15824 --- [nio-8080-exec-4] o.s.b.w.servlet.support.ErrorPageFilter : Forwarding to error page from request [/index.jsp] due to exception [java.lang.ExceptionInInitializerError]
javax.servlet.ServletException: java.lang.ExceptionInInitializerError
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:338) ~[jasper.jar:9.0.37]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[servlet-api.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-websocket.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:124) ~[druid-1.1.20.jar:1.1.20]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:128) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:66) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:103) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:121) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93) [spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.37]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [catalina.jar:9.0.37]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:9.0.37]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [catalina.jar:9.0.37]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [catalina.jar:9.0.37]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [catalina.jar:9.0.37]
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690) [catalina.jar:9.0.37]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [catalina.jar:9.0.37]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [catalina.jar:9.0.37]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-coyote.jar:9.0.37]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-coyote.jar:9.0.37]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-coyote.jar:9.0.37]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) [tomcat-coyote.jar:9.0.37]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:9.0.37]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_171]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_171]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:9.0.37]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
Caused by: java.lang.ExceptionInInitializerError: null
at org.apache.jasper.compiler.Validator$ValidateVisitor.prepareExpression(Validator.java:1626) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:759) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:958) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2389) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2441) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2447) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Node$Root.accept(Node.java:470) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2389) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1857) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:224) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:386) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:362) ~[jasper.jar:9.0.37]
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:346) ~[jasper.jar:9.0.37]
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:605) ~[jasper.jar:9.0.37]
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:400) ~[jasper.jar:9.0.37]
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) ~[jasper.jar:9.0.37]
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) ~[jasper.jar:9.0.37]
... 49 common frames omitted
Caused by: java.lang.NullPointerException: null
at java.util.Objects.requireNonNull(Objects.java:203) ~[na:1.8.0_171]
at javax.el.CompositeELResolver.add(CompositeELResolver.java:47) ~[el-api.jar:3.0.FR]
at org.apache.jasper.el.ELContextImpl.<clinit>(ELContextImpl.java:87) ~[jasper.jar:9.0.37]
... 66 common frames omitted
