DAS数据库访问，同步控制问题

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TJ

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Aug 17, 2009, 11:09:20 PM8/17/09

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Raymond Feng，你好！
感谢您和DAS开发团队的帮忙，DAS的内存泄漏问题已再没有发生，并且在读取数据的速度上还有了提升！

但这几天，我们做了一次简单的压力测试，测试方法是几个线程同时执行同一个读取数据的方法，总会发生异常。
以下是测试代码中的核心部分：
@Scope("COMPOSITE")
public class ProductDAO extends BaseDAO implements IProductDAO {

// 分页获取商品数据
public DataObject listProdByShop(long shopId, short status,
Map<String, Object> filterMap, Map<String, Boolean>
sortMap,
int curPage, int pageSize)
{
/* 根据DAS的配置文件，创建DAS实例
ITU4DAS继承DAS,ITU4DASImpl与框架里的DASImpl可以看成是一样的,DAS是以临时变量方式存在，方
法执行完毕后，立即销毁。
*/
ITU4DAS das = createDas();
try {
DataObject ret = executeQuery(getCommand(das,
"listProdByShop"), status, shopId, (curPage-1) * pageSize, pageSize);
List<DataObject> prodList = ret.getList("product");
if(prodList.isEmpty()){
return null;
}else{
DataObject prodListSdo = CommonSDOFactory.getInstance
().createDataObject(DEFAULT_URI, "productListType");
for(DataObject prod : prodList){
DataObject prodSdo = prodListSdo.createDataObject
("product");
convertToSdo(prod, prodSdo);
}
return prodListSdo;
}
} finally {
releaseDas(das);
}
}

/* 获取商品总数 */
public int countProdByShop(long shopId, short status, Map<String,
Object> filterMap,
Map<String, Boolean> sortMap)
{
ITU4DAS das = createDas();
try {
DataObject ret = executeQuery(getCommand(das,
"countProdByShop"), shopId, status);
long count = ret.getLong("result[1]/count");
return (int)count;
} finally {
releaseDas(das);
}
}
}

/* 商品服务类 */
@Scope("COMPOSITE")
@Service(IProductDAS.class)
public class ProductDAS implements IProductDAS
{
@Reference
protected IProductDAO productDao;

/* 分页获取商品信息，调用了ProductDAO里的listProdByShop和countProdByShop方法 */
public DataObject listProdByShop(long shopId, short status,
Map<String, Object> filterMap, Map<String, Boolean>
sortMap,
int curPage, int pageSize)
{
DataObject ret = null;
try
{
/* CommonSDOFactory是单例类，功能是创建DataObject */
ret = CommonSDOFactory.createDynDataObject();
int count = getProductDao().countProdByShop(shopId,
status, filterMap, sortMap);
int pageCount = PageValidaterUtil.getPageCount(count,
pageSize);
if(curPage > pageCount){
curPage = pageCount;
}
if(count > 0 ){
DataObject prodListSdo = getProductDao().listProdByShop
(shopId, status, filterMap, sortMap, curPage, pageSize);
ret.setDataObject("productList", prodListSdo);
ret.set("count", count);
ret.setBoolean("status/value", true);
}else{
ret.setString("status/msg",
Constant.PRODUCT_LIST_IS_EMPTY);
}
}catch(Exception e){
LogerUtil.error(this.getClass(), "[ProductDAS:listProdByShop]
Exception << " + e, e);
ret.setBoolean("status/exception",true);
ret.setString("status/msg", Constant.SQL_SVR_ERR);
}
return ret;
}

}

/* 商品服务测试类 */
public class ProductDasTest extends BaseTest
{
private IProductDAS productDas = null;

public ProductDasTest(){
super.init("Product.composite");
productDas = (IProductDAS) getService(IProductDAS.class,
"productDas");
}

public void listProdByShop(){
for(int i=0; i < 8; i++){
Thread t = new Thread(new Runnable(){
public void run() {
for(int j = 0; j < 50; j++){
productDas.listProdByShop(1,Short.parseShort("0"), null, null,
1, 20);
System.out.println(Thread.currentThread().getName() + "
Runing...");
}
}
});
t.start();
}
}

/* 通过main方法，调用测试方法 */
public static void main(String[] args)
{
ProductDasTest p = new ProductDasTest();
p.listProdByShop();
}
}

在执行过程中，时常发生异常，我收集了一些不同的错误信息，如下：
一、
java.util.ConcurrentModificationException
at org.eclipse.emf.common.util.BasicEList$EIterator.checkModCount
(BasicEList.java:1327)
at org.eclipse.emf.common.util.BasicEList$EIterator.next
(BasicEList.java:1275)
at org.apache.tuscany.sdo.impl.ClassImpl.initPropertyLists
(ClassImpl.java:270)
at org.apache.tuscany.sdo.impl.ClassImpl.getExtendedProperties
(ClassImpl.java:254)
at org.apache.tuscany.sdo.impl.ClassImpl.isOpen(ClassImpl.java:119)
at org.apache.tuscany.sdo.impl.ClassImpl.getProperty(ClassImpl.java:
502)
at
org.apache.tuscany.sdo.helper.SDOHelperImpl.createOpenContentProperty
(SDOHelperImpl.java:459)
at org.apache.tuscany.sdo.api.SDOUtil.createOpenContentProperty
(SDOUtil.java:358)
at org.apache.tuscany.sdo.util.DataObjectUtil.demandOpenProperty
(DataObjectUtil.java:1883)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.setFeatureName
(DataObjectUtil.java:2149)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.process
(DataObjectUtil.java:2296)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.init
(DataObjectUtil.java:2017)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.create
(DataObjectUtil.java:1932)
at org.apache.tuscany.sdo.util.DataObjectUtil.set(DataObjectUtil.java:
765)
at org.apache.tuscany.sdo.impl.DataObjectImpl.set(DataObjectImpl.java:
231)
at
com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdByShop
(ProductDAS.java:731)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy9.listProdByShop(Unknown Source)
at com.eading.itu4.core.tuscany.service.test.saleshop.ProductDasTest
$1.run(ProductDasTest.java:195)
at java.lang.Thread.run(Unknown Source)

二、
java.lang.IllegalArgumentException: The feature 'productList' is not a
valid changeable feature
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eOpenSet
(BasicEObjectImpl.java:727)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eSet
(BasicEObjectImpl.java:658)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.set
(DataObjectUtil.java:2074)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.setAndRecyle
(DataObjectUtil.java:2080)
at org.apache.tuscany.sdo.util.DataObjectUtil.set(DataObjectUtil.java:
765)
at org.apache.tuscany.sdo.impl.DataObjectImpl.setDataObject
(DataObjectImpl.java:496)
at
com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdByShop
(ProductDAS.java:730)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy9.listProdByShop(Unknown Source)
at com.eading.itu4.core.tuscany.service.test.saleshop.ProductDasTest
$1.run(ProductDasTest.java:195)
at java.lang.Thread.run(Unknown Source)

三、
java.lang.NullPointerException
at org.apache.tuscany.sdo.helper.SDOHelperImpl.createProperty
(SDOHelperImpl.java:408)
at org.apache.tuscany.sdo.api.SDOUtil.createProperty(SDOUtil.java:
343)
at
org.apache.tuscany.das.rdb.graphbuilder.impl.GraphBuilderMetadata.createDynamicTypes
(GraphBuilderMetadata.java:133)
at
org.apache.tuscany.das.rdb.graphbuilder.impl.GraphBuilderMetadata.getRootType
(GraphBuilderMetadata.java:98)
at org.apache.tuscany.das.rdb.impl.ReadCommandImpl.buildGraph
(ReadCommandImpl.java:302)
at org.apache.tuscany.das.rdb.impl.ReadCommandImpl.executeQuery
(ReadCommandImpl.java:277)
at com.eading.itu4.core.tuscany.dao.impl.BaseDAO.executeQuery
(BaseDAO.java:53)
at com.eading.itu4.core.tuscany.dao.impl.ProductDAO.listProdByShop
(ProductDAO.java:530)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy10.listProdByShop(Unknown Source)
at
com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdByShop
(ProductDAS.java:729)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy9.listProdByShop(Unknown Source)
at com.eading.itu4.core.tuscany.service.test.saleshop.ProductDasTest
$1.run(ProductDasTest.java:195)
at java.lang.Thread.run(Unknown Source)

四、
java.lang.IllegalArgumentException: The feature 'count' is not a valid
changeable feature
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eOpenSet
(BasicEObjectImpl.java:727)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eSet
(BasicEObjectImpl.java:658)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.set
(DataObjectUtil.java:2074)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.setAndRecyle
(DataObjectUtil.java:2080)
at org.apache.tuscany.sdo.util.DataObjectUtil.set(DataObjectUtil.java:
765)
at org.apache.tuscany.sdo.impl.DataObjectImpl.set(DataObjectImpl.java:
231)
at
com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdByShop
(ProductDAS.java:731)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy9.listProdByShop(Unknown Source)
at com.eading.itu4.core.tuscany.service.test.saleshop.ProductDasTest
$1.run(ProductDasTest.java:195)
at java.lang.Thread.run(Unknown Source)

五、
java.lang.NullPointerException
at org.eclipse.emf.ecore.util.EcoreEList.resolveProxy(EcoreEList.java:
192)
at org.eclipse.emf.ecore.util.EcoreEList.resolve(EcoreEList.java:152)
at org.eclipse.emf.ecore.util.EObjectContainmentWithInverseEList
$Resolving.resolve(EObjectContainmentWithInverseEList.java:94)
at org.eclipse.emf.common.util.BasicEList.get(BasicEList.java:514)
at org.eclipse.emf.ecore.util.BasicExtendedMetaData
$EPackageExtendedMetaDataImpl.getType(BasicExtendedMetaData.java:2069)
at org.eclipse.emf.ecore.util.BasicExtendedMetaData.getType
(BasicExtendedMetaData.java:114)
at
org.apache.tuscany.sdo.helper.SDOHelperImpl.createOpenContentProperty
(SDOHelperImpl.java:453)
at org.apache.tuscany.sdo.api.SDOUtil.createOpenContentProperty
(SDOUtil.java:358)
at org.apache.tuscany.sdo.util.DataObjectUtil.demandOpenProperty
(DataObjectUtil.java:1883)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.setFeatureName
(DataObjectUtil.java:2149)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.process
(DataObjectUtil.java:2296)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.init
(DataObjectUtil.java:2017)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.create
(DataObjectUtil.java:1932)
at org.apache.tuscany.sdo.util.DataObjectUtil.set(DataObjectUtil.java:
765)
at org.apache.tuscany.sdo.impl.DataObjectImpl.set(DataObjectImpl.java:
231)
at
com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdByShop
(ProductDAS.java:731)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy9.listProdByShop(Unknown Source)
at com.eading.itu4.core.tuscany.service.test.saleshop.ProductDasTest
$1.run(ProductDasTest.java:195)
at java.lang.Thread.run(Unknown Source)

六、
java.lang.NullPointerException
at
org.apache.tuscany.das.rdb.graphbuilder.impl.GraphBuilderMetadata.createDynamicTypes
(GraphBuilderMetadata.java:131)
at
org.apache.tuscany.das.rdb.graphbuilder.impl.GraphBuilderMetadata.getRootType
(GraphBuilderMetadata.java:98)
at org.apache.tuscany.das.rdb.impl.ReadCommandImpl.buildGraph
(ReadCommandImpl.java:302)
at org.apache.tuscany.das.rdb.impl.ReadCommandImpl.executeQuery
(ReadCommandImpl.java:277)
at com.eading.itu4.core.tuscany.dao.impl.BaseDAO.executeQuery
(BaseDAO.java:53)
at com.eading.itu4.core.tuscany.dao.impl.ProductDAO.listProdByShop
(ProductDAO.java:530)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy10.listProdByShop(Unknown Source)
at
com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdByShop
(ProductDAS.java:729)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy9.listProdByShop(Unknown Source)
at com.eading.itu4.core.tuscany.service.test.saleshop.ProductDasTest
$1.run(ProductDasTest.java:195)
at java.lang.Thread.run(Unknown Source)

七、
java.lang.NullPointerException
at org.apache.tuscany.sdo.util.DataObjectUtil.isInternalProperty
(DataObjectUtil.java:395)
at org.apache.tuscany.sdo.impl.ClassImpl.initPropertyLists
(ClassImpl.java:271)
at org.apache.tuscany.sdo.impl.ClassImpl.getExtendedProperties
(ClassImpl.java:254)
at org.apache.tuscany.sdo.impl.ClassImpl.isOpen(ClassImpl.java:119)
at org.apache.tuscany.sdo.impl.ClassImpl.getProperty(ClassImpl.java:
502)
at
org.apache.tuscany.sdo.helper.SDOHelperImpl.createOpenContentProperty
(SDOHelperImpl.java:459)
at org.apache.tuscany.sdo.api.SDOUtil.createOpenContentProperty
(SDOUtil.java:358)
at org.apache.tuscany.sdo.util.DataObjectUtil.demandOpenProperty
(DataObjectUtil.java:1883)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.setFeatureName
(DataObjectUtil.java:2149)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.process
(DataObjectUtil.java:2296)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.init
(DataObjectUtil.java:2017)
at org.apache.tuscany.sdo.util.DataObjectUtil$Accessor.create
(DataObjectUtil.java:1932)
at org.apache.tuscany.sdo.util.DataObjectUtil.set(DataObjectUtil.java:
765)
at org.apache.tuscany.sdo.impl.DataObjectImpl.set(DataObjectImpl.java:
231)
at
com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdByShop
(ProductDAS.java:731)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke
(JavaImplementationInvoker.java:156)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke
(SCABindingInvoker.java:61)
at
org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke
(PassByValueInterceptor.java:60)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:309)
at org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke
(JDKInvocationHandler.java:156)
at $Proxy9.listProdByShop(Unknown Source)
at com.eading.itu4.core.tuscany.service.test.saleshop.ProductDasTest
$1.run(ProductDasTest.java:195)
at java.lang.Thread.run(Unknown Source)

现在我怀疑是SDO或者DAS里在访问同步问题上没有处理好，请 Raymond Feng 找相关的开发人员帮忙解决一下，万分感谢！ ⊙﹏⊙

TJ

unread,

Aug 19, 2009, 10:57:30 PM8/19/09

to Tuscany SCA 中文论坛

顶一下

> com.eading.itu4.core.tuscany.service.impl.saleshop.ProductDAS.listProdBySho-p

> (ProductDAS.java:731)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at