title: Error starting Tomcat context with Spring-Boot: java.lang.ClassNotFoundException: org.apache.tomcat.dbcp.dbcp.BasicDataSource
body: <p>I recently decide add spring-boot to a existing spring project which uses hibernate configured by java code. I have this pom.xml file:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt;
      &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
  
      &lt;groupId&gt;com.spring&lt;/groupId&gt;
      &lt;artifactId&gt;app&lt;/artifactId&gt;
      &lt;version&gt;0.1.0&lt;/version&gt;
  
      &lt;parent&gt;
          &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
          &lt;artifactId&gt;spring-boot-starter-parent&lt;/artifactId&gt;
          &lt;version&gt;1.1.8.RELEASE&lt;/version&gt;
      &lt;/parent&gt;
  
      &lt;dependencies&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-actuator&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.security&lt;/groupId&gt;
              &lt;artifactId&gt;spring-security-web&lt;/artifactId&gt;
              &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.security&lt;/groupId&gt;
              &lt;artifactId&gt;spring-security-config&lt;/artifactId&gt;
              &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.security&lt;/groupId&gt;
              &lt;artifactId&gt;spring-security-taglibs&lt;/artifactId&gt;
              &lt;/dependency&gt;
          &lt;dependency&gt;
             &lt;groupId&gt;org.hibernate&lt;/groupId&gt;
             &lt;artifactId&gt;hibernate-core&lt;/artifactId&gt;
             &lt;version&gt;4.3.6.Final&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework&lt;/groupId&gt;
              &lt;artifactId&gt;spring-orm&lt;/artifactId&gt;
              &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework&lt;/groupId&gt;
              &lt;artifactId&gt;spring-tx&lt;/artifactId&gt;
              &lt;/dependency&gt;
      &lt;/dependencies&gt;
  
      &lt;properties&gt;
          &lt;start-class&gt;com.spring.app.Application&lt;/start-class&gt;
      &lt;/properties&gt;
  
      &lt;build&gt;
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
                  &lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
      &lt;/build&gt;
  
  &lt;/project&gt;
  </code></pre>
  
  <p>When I try run the applications (after the commands: mvn compile / mvn package / java -jar ), I get this error:</p>
  
  <pre><code>Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.dbcp.dbcp.BasicDataSource
      at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
      at org.springframework.boot.loader.LaunchedURLClassLoader.doLoadClass(LaunchedURLClassLoader.java:168)
      at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:134)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
      ... 136 common frames omitted
  </code></pre>
  
  <p>anyone can tell me what I am missing here?</p>