ejbJar : <xml-fragment version="2.1" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:j2ee="http://java.sun.com/xml/ns/j2ee">
<j2ee:display-name>ConverterJAR</j2ee:display-name>
<j2ee:enterprise-beans>
<j2ee:session>
<j2ee:ejb-name>ConverterBean</j2ee:ejb-name>
<j2ee:home>converter.ConverterHome</j2ee:home>
<j2ee:remote>converter.Converter</j2ee:remote>
<j2ee:ejb-class>converter.ConverterBean</j2ee:ejb-class>
<j2ee:session-type>Stateless</j2ee:session-type>
<j2ee:transaction-type>Bean</j2ee:transaction-type>
<j2ee:security-identity>
<j2ee:use-caller-identity/>
</j2ee:security-identity>
</j2ee:session>
</j2ee:enterprise-beans>
</xml-fragment>
java.lang.NullPointerException
at org.openejb.deployment.OpenEJBModuleBuilder.addGBeans(OpenEJBModuleBuilder.java:426)
at org.openejb.deployment.OpenEJBModuleBuilder$$FastClassByCGLIB$$11bd7b20.invoke()
at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:87)
at org.apache.geronimo.gbean.jmx.FastMethodInvoker.invoke(FastMethodInvoker.java:38)
at org.apache.geronimo.gbean.jmx.GBeanMBeanOperation.invoke(GBeanMBeanOperation.java:141)
at org.apache.geronimo.gbean.jmx.GBeanMBean.invoke(GBeanMBean.java:740)
at org.apache.geronimo.gbean.jmx.RawInvoker.invoke(RawInvoker.java:89)
at org.apache.geronimo.gbean.jmx.RawOperationInvoker.invoke(RawOperationInvoker.java:34)
at org.apache.geronimo.gbean.jmx.CGLibMethodInterceptor.intercept(CGLibMethodInterceptor.java:110)
at org.apache.geronimo.j2ee.deployment.ModuleBuilder$$EnhancerByCGLIB$$9e45a280.addGBeans()
at org.apache.geronimo.j2ee.deployment.EARConfigBuilder.buildConfiguration(EARConfigBuilder.java:225)
at org.apache.geronimo.j2ee.deployment.EARConfigBuilder.buildConfiguration(EARConfigBuilder.java:148)
at org.apache.geronimo.j2ee.deployment.EARConfigBuilder$$FastClassByCGLIB$$38e56ec6.invoke()
at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:87)
at org.apache.geronimo.gbean.jmx.FastMethodInvoker.invoke(FastMethodInvoker.java:38)
at org.apache.geronimo.gbean.jmx.GBeanMBeanOperation.invoke(GBeanMBeanOperation.java:141)
at org.apache.geronimo.gbean.jmx.GBeanMBean.invoke(GBeanMBean.java:740)
at org.apache.geronimo.gbean.jmx.RawInvoker.invoke(RawInvoker.java:89)
at org.apache.geronimo.gbean.jmx.RawOperationInvoker.invoke(RawOperationInvoker.java:34)
at org.apache.geronimo.gbean.jmx.CGLibMethodInterceptor.intercept(CGLibMethodInterceptor.java:110)
at org.apache.geronimo.deployment.ConfigurationBuilder$$EnhancerByCGLIB$$7a1ca0ae.buildConfiguration()
at org.apache.geronimo.deployment.Deployer.deploy(Deployer.java:132)
at org.apache.geronimo.deployment.Deployer$$FastClassByCGLIB$$734a235d.invoke()
at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:87)
at org.apache.geronimo.gbean.jmx.FastMethodInvoker.invoke(FastMethodInvoker.java:38)
at org.apache.geronimo.gbean.jmx.GBeanMBeanOperation.invoke(GBeanMBeanOperation.java:141)
at org.apache.geronimo.gbean.jmx.GBeanMBean.invoke(GBeanMBean.java:761)
at mx4j.server.interceptor.InvokerMBeanServerInterceptor.invoke(InvokerMBeanServerInterceptor.java:218)
at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:121)
at mx4j.server.interceptor.SecurityMBeanServerInterceptor.invoke(SecurityMBeanServerInterceptor.java:86)
at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:121)
at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:121)
at mx4j.server.interceptor.ContextClassLoaderMBeanServerInterceptor.invoke(ContextClassLoaderMBeanServerInterceptor.java:205)
at mx4j.server.MX4JMBeanServer.invoke(MX4JMBeanServer.java:1079)
at org.apache.geronimo.kernel.Kernel.invoke(Kernel.java:231)
at org.apache.geronimo.system.main.CommandLine.main(CommandLine.java:82)

Seems to be that this bug is due to the fact that the builder is looking for the assembly-descriptor element. This element is optional according xml schema descriptor file http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd