java.lang.NoClassDefFoundError：org/apache/poi/EncryptedDocumentException

Question

我正在构建一个web应用程序并使用apache poi来处理excel工作表。当我启动服务器时，出现以下异常。事情是它用于正常工作，直到我试图建立它并部署在heroku（但可能是无关紧要的）。 有人有想法吗？

INFO: Starting service Catalina 
Apr 15, 2016 8:28:35 PM org.apache.catalina.core.StandardEngine startInternal 
INFO: Starting Servlet Engine: Apache Tomcat/7.0.53 
Apr 15, 2016 8:28:36 PM org.apache.catalina.core.StandardContext listenerStart 
SEVERE: Exception sending context initialized event to listener instance of class org.engine.OnStartup 
java.lang.NoClassDefFoundError: org/apache/poi/EncryptedDocumentException 
    at org.engine.OnStartup.contextInitialized(OnStartup.java:16) 
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:262) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: java.lang.ClassNotFoundException: org.apache.poi.EncryptedDocumentException 
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720) 
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571) 
    ... 10 more 

我的pom.xml文件：

<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"> 
<modelVersion>4.0.0</modelVersion> 
<groupId>psilos-toy</groupId> 
<artifactId>psilos-toy</artifactId> 
<version>0.0.1-SNAPSHOT</version> 
<dependencies> 
    <dependency> 
     <groupId>com.sun.jersey</groupId> 
     <artifactId>jersey-server</artifactId> 
     <version>1.8</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.httpcomponents</groupId> 
     <artifactId>httpclient</artifactId> 
     <version>4.3.1</version> 
    </dependency> 
    <dependency> 
     <groupId>com.google.code.gson</groupId> 
     <artifactId>gson</artifactId> 
     <version>2.2.4</version> 
    </dependency> 
    <dependency> 
     <groupId>org.codehaus.httpcache4j.resolvers</groupId> 
     <artifactId>resolvers-net-urlconnection</artifactId> 
     <version>4.0-M6</version> 
    </dependency> 

    <!-- Apache POI,for handling Excel Files --> 
    <dependency> 
     <groupId>org.apache.poi</groupId> 
     <artifactId>poi</artifactId> 
     <version>3.14</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.poi</groupId> 
     <artifactId>poi-ooxml</artifactId> 
     <version>3.14</version> 
    </dependency> 
    <!-- jersey --> 
    <dependency> 
     <groupId>com.sun.jersey</groupId> 
     <artifactId>jersey-server</artifactId> 
     <version>1.8</version> 
    </dependency> 
</dependencies> 

和我的web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" id="WebApp_ID" version="2.4"> 
    <display-name>Restful Web Application</display-name> 
    <servlet> 
    <servlet-name>jersey-serlvet</servlet-name> 
    <servlet-class> 
        com.sun.jersey.spi.container.servlet.ServletContainer 
       </servlet-class> 
    <init-param> 
     <param-name>com.sun.jersey.config.property.packages</param-name> 
     <param-value>org.endpoints</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>jersey-serlvet</servlet-name> 
    <url-pattern>/*</url-pattern> 
    </servlet-mapping> 
    <listener> 
    <listener-class>org.engine.OnStartup</listener-class> 
    </listener> 
</web-app> 

Answer 1

也许是工作的一个Tomcat设置是有可对POI类classpath。在新的Heroku设置中，也许你没有Tomcat 7可用的类（我没有彻底检查poi类是否与Tomcat 7捆绑在一起）。

您可以做的最简单的事情就是通过将poi类与您的应用程序捆绑在一起来构建一个自包含的应用程序。这会增加您的应用程序的大小，但您可以控制poi库的版本。当然，您可以将库复制到定义的文件夹（您知道Tomcat从中加载类）。有关详细信息，请参阅maven-shade-plugin。