struts2+spring3+mybatis的JAR包整合问题

以下是所有整合的JAR包:
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antlr-2.7.2.jar
aopalliance-1.0.jar
asm-3.3.jar
asm-commons-3.3.jar
c3p0-0.9.1.jar
commons-beanutils-1.8.0.jar
commons-collections-3.1.jar
commons-fileupload-1.2.2.jar
commons-io-2.0.1.jar
commons-lang-2.4.jar
commons-lang3-3.1.jar
commons-logging-1.1.1.jar
dwr-1.1.1.jar
ezmorph-1.0.6.jar
freeer-2.3.19.jar
javassist-3.11.0.GA.jar
jettison-1.1.jar
json-lib-2.3-jdk15.jar
junit-4.11-SNAPSHOT-20120416-1530.jar
mybatis-3.1.1.jar
mybatis-spring-1.0.0-RC3.jar
mysql-connector-java-5.1.21-bin.jar
ognl-3.0.5.jar
sitemesh-2.4.2.jar
spring-aop-3.0.5.RELEASE.jar
spring-asm-3.0.5.RELEASE.jar
spring-batch-core-2.1.8.RELEASE.jar
spring-batch-infrastructure-2.1.8.RELEASE.jar
spring-beans-3.0.5.RELEASE.jar
spring-context-3.0.5.RELEASE.jar
spring-core-3.0.5.RELEASE.jar
spring-expression-3.0.5.RELEASE.jar
spring-jdbc-3.1.1.RELEASE.jar
spring-tx-3.1.1.RELEASE.jar
spring-web-3.0.5.RELEASE.jar
struts-core-1.3.10.jar
struts2-config-browser-plugin-2.3.4.jar
struts2-convention-plugin-2.3.4.jar
struts2-core-2.3.4.jar
struts2-dwr-plugin-2.3.4.jar
struts2-json-plugin-2.3.4.jar
struts2-junit-plugin-2.3.4.jar
struts2-spring-plugin-2.3.4.jar
xpp3_min-1.1.4c.jar
xstream-1.4.2.jar
xwork-core-2.3.4.jar
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为何tomcat启动报错？
java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2882)
at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
at java.lang.StringBuffer.append(StringBuffer.java:224)
at java.io.StringWriter.write(StringWriter.java:95)
at java.io.PrintWriter.write(PrintWriter.java:412)
at java.io.PrintWriter.write(PrintWriter.java:429)
at java.io.PrintWriter.print(PrintWriter.java:559)
at java.io.PrintWriter.println(PrintWriter.java:695)
at java.lang.Throwable.printStackTrace(Throwable.java:512)
at org.springframework.beans.factory.BeanCreationException.printStackTrace(BeanCreationException.java:176)
at org.springframework.beans.factory.BeanCreationException.printStackTrace(BeanCreationException.java:180)
at java.util.logging.SimpleFormatter.format(SimpleFormatter.java:72)
at java.util.logging.StreamHandler.publish(StreamHandler.java:179)
at java.util.logging.ConsoleHandler.publish(ConsoleHandler.java:88)
at java.util.logging.Logger.log(Logger.java:472)
at java.util.logging.Logger.doLog(Logger.java:494)
at java.util.logging.Logger.logp(Logger.java:694)
at org.apache.commons.logging.impl.Jdk14Logger.log(Jdk14Logger.java:101)
at org.apache.commons.logging.impl.Jdk14Logger.error(Jdk14Logger.java:149)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:220)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3830)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4337)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)求高手解答！！！！