JSP Unable to Load Class (posted in Java Programming for 5 Dukes)

I hope this isn't a violation of forum etiquette, but I posted my question in Java Programming at http://forum.java.sun.com/thread.jsp?forum=31&thread=203255
I realize now that it may have been wiser to post it here, but I have some replies already and it makes more sense just to inlcude the link.
Can anyone assist with the question at http://forum.java.sun.com/thread.jsp?forum=31&thread=203255
It's worth 5 dukes.

Try changing <tagclass>E:\Tomcat324\jakarta-tomcat-3.2.4\webapps\examples\WEB-INF\classes\tags.ExampleTag</tagclass> to <tagclass>tags.ExampleTag</tagclass>
because <tagclass> tag is for the class name and not the location of class file
And make sure your ExampleTag.class file is in
\WEB-INF\classes\tag\ExampleTag.class
B!

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         <jsp-version>1.2</jsp-version>
         <short-name>genericDBConnect</short-name>
         <tag>
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              <tag-class>jsp.tags.dbase.genericDBConnect</tag-class>          
              <attribute>
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                   <required>true</required>
                   <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
                   <name>odbcDriver</name>
                   <required>true</required>
                   <rtexprvalue>true</rtexprvalue>
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    DBTester.jsp
    Stored in:C:\jakarta-tomcat-3.2.3\webapps\exper
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <html>
    <head>
         <title>Generic dataBase Connection</title>
    </head>
    <body>
    <%@ taglib uri="/genericdbconnecttags.tld" prefix="database" %>
    <database:dbconnect odbcDriver="sun.my.tag.lib" dataSource="hello">
    this is the the begining of the end of life as we know it
    </database:dbconnect>
    </body>
    </html>
    And this is the error I get:
    Error: 500
    Location: /exper/DBtester.jsp
    Internal Servlet Error:
    org.apache.jasper.compiler.CompileException: C:\jakarta-tomcat-3.2.3\webapps\exper\DBtester.jsp(8,0) Unable to load class null
         at org.apache.jasper.compiler.TagBeginGenerator.init(TagBeginGenerator.java:129)
         at org.apache.jasper.compiler.JspParseEventListener$GeneratorWrapper.init(JspParseEventListener.java:759)
         at org.apache.jasper.compiler.JspParseEventListener.addGenerator(JspParseEventListener.java:138)
         at org.apache.jasper.compiler.JspParseEventListener.handleTagBegin(JspParseEventListener.java:909)
         at org.apache.jasper.compiler.DelegatingListener.handleTagBegin(DelegatingListener.java:194)
         at org.apache.jasper.compiler.Parser$Tag.accept(Parser.java:825)
         at org.apache.jasper.compiler.Parser.parse(Parser.java:1077)
         at org.apache.jasper.compiler.Parser.parse(Parser.java:1042)
         at org.apache.jasper.compiler.Parser.parse(Parser.java:1038)
         at org.apache.jasper.compiler.Compiler.compile(Compiler.java:209)
         at org.apache.jasper.servlet.JspServlet.doLoadJSP(JspServlet.java:612)
         at org.apache.jasper.servlet.JasperLoader12.loadJSP(JasperLoader12.java:146)
         at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:542)
         at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:258)
         at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:268)
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         at org.apache.tomcat.core.Handler.service(Handler.java:287)
         at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
         at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
         at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
         at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
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         at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
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              <tag-class>sas.ric.tags.teste.ClTagHello</tag-class>
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    ======================== JSP =====================
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <HTML>
    <HEAD>
    <META name="GENERATOR" content="IBM WebSphere Studio">
    <META http-equiv="Content-Style-Type" content="text/css">
    </HEAD>
    <%@ taglib uri="WEB-INF/app-tlds/tag-hello.tld" prefix="ric" %>
    <BODY>
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    </BODY>
    </HTML>
    ==========================================================
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  • Wrapped: Unable to load class "com.cache.DBCacheStore"

    Hi,
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    (Wrapped: Unable to load class "com.cache.DBCacheStore" using sun.misc.Launc
    [email protected]
    <class-scheme>
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    I have the CLASSPATH set to the location of DBCacheStore.class file both in cache-server.cmd and in my application startup JVM params. But still i am not able to resolve this issue. However i am still able to hit the database and get the values for the first call and on sub-sequent call, i am able to retrive the value from cache. I also encounter the below error, after i have retrieved the values from cache...
    2010-11-10 15:08:31.553/29.671 Oracle Coherence GE 3.6.0.0 <Error> (thread=Distr
    ibutedCache, member=1): Terminating PartitionedCache due to unhandled exception:
    java.lang.UnsupportedOperationException
    2010-11-10 15:08:31.553/29.671 Oracle Coherence GE 3.6.0.0 <Error> (thread=Distr
    ibutedCache, member=1):
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                   Caches with names that start with 'Virtual' will be created
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              <cache-mapping>
                   <cache-name>Virtual*</cache-name>
                   <scheme-name>distributed-db-backed</scheme-name>
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                        <read-write-backing-map-scheme>
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                             <cachestore-scheme>
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                                       <class-name>
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                                       <init-params>
                                            <init-param>
                                                 <param-type>
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                                                 </param-type>
                                                 <param-value>
                                                      EMP_ADDR_VIEW
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                                       </init-params>
                                  </class-scheme>
                             </cachestore-scheme>
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                             -->
                             <write-delay-seconds>0</write-delay-seconds>
                        </read-write-backing-map-scheme>
                   </backing-map-scheme>
                   <listener />
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    Edited by: user1073902 on Nov 10, 2010 4:25 AM

    Hello Noah,
         I have listed the contents of log file ( for both cache-server.cmd and the client application ).
    cache-server.cmd Log File
    =========================
    java version "1.6.0_20"
    Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
    Java HotSpot(TM) Server VM (build 16.3-b01, mixed mode)
    2010-11-11 09:51:49.634/0.236 Oracle Coherence 3.6.0.0 <Info> (thread=main, memb
    er=n/a): Loaded operational configuration from "jar:file:/E:/coherence/lib/coher
    ence.jar!/tangosol-coherence.xml"
    2010-11-11 09:51:49.634/0.236 Oracle Coherence 3.6.0.0 <Info> (thread=main, memb
    er=n/a): Loaded operational overrides from "jar:file:/E:/coherence/lib/coherence
    .jar!/tangosol-coherence-override-dev.xml"
    2010-11-11 09:51:49.634/0.236 Oracle Coherence 3.6.0.0 <D5> (thread=main, member
    =n/a): Optional configuration override "/tangosol-coherence-override.xml" is not
    specified
    2010-11-11 09:51:49.649/0.251 Oracle Coherence 3.6.0.0 <D5> (thread=main, member
    =n/a): Optional configuration override "/custom-mbeans.xml" is not specified
    2010-11-11 09:51:49.649/0.251 Oracle Coherence 3.6.0.0 <D6> (thread=main, member
    =n/a): Loaded edition data from "jar:file:/E:/coherence/lib/coherence.jar!/coher
    ence-grid.xml"
    Oracle Coherence Version 3.6.0.0 Build 17229
    Grid Edition: Development mode
    Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
    2010-11-11 09:51:49.885/0.487 Oracle Coherence GE 3.6.0.0 <Info> (thread=main, m
    ember=n/a): Loaded cache configuration from "file:/E:/bea/user_projects/workspac
    es/workSpaceStudio/coh/cache-config.xml"
    2010-11-11 09:51:50.231/0.833 Oracle Coherence GE 3.6.0.0 <D4> (thread=main, mem
    ber=n/a): TCMP bound to /10.144.32.78:8088 using SystemSocketProvider
    2010-11-11 09:51:53.786/4.388 Oracle Coherence GE 3.6.0.0 <Info> (thread=Cluster
    , member=n/a): Created a new cluster "mycluster" with Member(Id=1, Timestamp=201
    0-11-11 09:51:50.231, Address=10.144.32.78:8088, MachineId=47694, Location=site:
    XyzT.CORP.Xyz.IN,machine:hdchshocms2026,process:4472, Role=CoherenceServer, Edit
    ion=Grid Edition, Mode=Development, CpuCount=2, SocketCount=2) UID=0x0A90204E000
    0012C392B0817BA4E1F98
    2010-11-11 09:51:53.786/4.388 Oracle Coherence GE 3.6.0.0 <Info> (thread=main, m
    ember=n/a): Started cluster Name=mycluster
    Group{Address=224.0.0.1, Port=5455, TTL=4}
    MasterMemberSet
    ThisMember=Member(Id=1, Timestamp=2010-11-11 09:51:50.231, Address=10.144.32.7
    8:8088, MachineId=47694, Location=site:XyzT.CORP.Xyz.IN,machine:hdchshocms2026,p
    rocess:4472, Role=CoherenceServer)
    OldestMember=Member(Id=1, Timestamp=2010-11-11 09:51:50.231, Address=10.144.32
    .78:8088, MachineId=47694, Location=site:XyzT.CORP.Xyz.IN,machine:hdchshocms2026
    ,process:4472, Role=CoherenceServer)
    ActualMemberSet=MemberSet(Size=1, BitSetCount=2
    Member(Id=1, Timestamp=2010-11-11 09:51:50.231, Address=10.144.32.78:8088, M
    achineId=47694, Location=site:XyzT.CORP.Xyz.IN,machine:hdchshocms2026,process:44
    72, Role=CoherenceServer)
    RecycleMillis=1200000
    RecycleSet=MemberSet(Size=0, BitSetCount=0
    TcpRing{Connections=[]}
    IpMonitor{AddressListSize=0}
    2010-11-11 09:51:53.833/4.435 Oracle Coherence GE 3.6.0.0 <D5> (thread=Invocatio
    n:Management, member=1): Service Management joined the cluster with senior servi
    ce member 1
    2010-11-11 09:51:54.085/4.687 Oracle Coherence GE 3.6.0.0 <D5> (thread=Distribut
    edCache, member=1): Service DistributedCache joined the cluster with senior serv
    ice member 1
    2010-11-11 09:51:54.101/4.703 Oracle Coherence GE 3.6.0.0 <D6> (thread=Distribut
    edCache, member=1): Service DistributedCache: sending PartitionConfig ConfigSync
    to all
    2010-11-11 09:51:54.116/4.718 Oracle Coherence GE 3.6.0.0 <Info> (thread=main, m
    ember=1):
    Services
    ClusterService{Name=Cluster, State=(SERVICE_STARTED, STATE_JOINED), Id=0, Vers
    ion=3.6, OldestMemberId=1}
    InvocationService{Name=Management, State=(SERVICE_STARTED), Id=1, Version=3.1,
    OldestMemberId=1}
    PartitionedCache{Name=DistributedCache, State=(SERVICE_STARTED), LocalStorage=
    enabled, PartitionCount=257, BackupCount=1, AssignedPartitions=257, BackupPartit
    ions=0}
    Started DefaultCacheServer...
    2010-11-11 09:55:41.209/231.811 Oracle Coherence GE 3.6.0.0 <D5> (thread=Cluster
    , member=1): Member(Id=2, Timestamp=2010-11-11 09:55:41.216, Address=10.144.32.7
    8:8090, MachineId=47694, Location=site:XyzT.CORP.Xyz.IN,machine:hdchshocms2026,p
    rocess:5304, Role=XyzCacheDatabaseCache) joined Cluster with senior member 1
    2010-11-11 09:55:41.209/231.811 Oracle Coherence GE 3.6.0.0 <D6> (thread=Cluster
    , member=1): TcpRing connecting to Member(Id=2, Timestamp=2010-11-11 09:55:41.21
    6, Address=10.144.32.78:8090, MachineId=47694, Location=site:XyzT.CORP.Xyz.IN,ma
    chine:hdchshocms2026,process:5304, Role=XyzCacheDatabaseCache)
    2010-11-11 09:55:41.209/231.811 Oracle Coherence GE 3.6.0.0 <D6> (thread=Cluster
    , member=1): TcpRing connected to Member(Id=2, Timestamp=2010-11-11 09:55:41.216
    , Address=10.144.32.78:8090, MachineId=47694, Location=site:XyzT.CORP.Xyz.IN,mac
    hine:hdchshocms2026,process:5304, Role=XyzCacheDatabaseCache)
    2010-11-11 09:55:41.287/231.889 Oracle Coherence GE 3.6.0.0 <D5> (thread=Cluster
    , member=1): Member 2 joined Service Management with senior member 1
    2010-11-11 09:55:41.553/232.155 Oracle Coherence GE 3.6.0.0 <D5> (thread=Cluster
    , member=1): Member 2 joined Service DistributedCache with senior member 1
    2010-11-11 09:55:41.553/232.155 Oracle Coherence GE 3.6.0.0 <Error> (thread=Dist
    ributedCache, member=1): BackingMapManager com.tangosol.net.DefaultConfigurableC
    acheFactory$Manager: failed to instantiate a cache: VirtualCache
    2010-11-11 09:55:41.553/232.155 Oracle Coherence GE 3.6.0.0 <Error> (thread=Dist
    ributedCache, member=1):
    (Wrapped: Unable to load class "com.cache.DBCacheStore" using sun.misc.Launc
    [email protected]
    <class-scheme>
    <class-name>com.cache.DBCacheStore</class-name>
    <init-params>
    <init-param>
    <param-type>java.lang.String</param-type>
    <param-value>EMP_ADDR_VIEW</param-value>
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    at com.tangosol.util.Base.ensureRuntimeException(Base.java:293)
    at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2487)
    at com.tangosol.net.DefaultConfigurableCacheFactory.instantiateAny(Defau
    ltConfigurableCacheFactory.java:3256)
    at com.tangosol.net.DefaultConfigurableCacheFactory.instantiateCacheStor
    e(DefaultConfigurableCacheFactory.java:3106)
    at com.tangosol.net.DefaultConfigurableCacheFactory.instantiateReadWrite
    BackingMap(DefaultConfigurableCacheFactory.java:1674)
    at com.tangosol.net.DefaultConfigurableCacheFactory.configureBackingMap(
    DefaultConfigurableCacheFactory.java:1429)
    at com.tangosol.net.DefaultConfigurableCacheFactory$Manager.instantiateB
    ackingMap(DefaultConfigurableCacheFactory.java:3904)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.g
    rid.partitionedService.PartitionedCache$Storage.instantiateResourceMap(Partition
    edCache.CDB:21)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.g
    rid.partitionedService.PartitionedCache$Storage.setCacheName(PartitionedCache.CD
    B:25)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.g
    rid.partitionedService.PartitionedCache$ServiceConfig$ConfigListener.entryInsert
    ed(PartitionedCache.CDB:17)
    at com.tangosol.util.MapEvent.dispatch(MapEvent.java:266)
    at com.tangosol.util.MapEvent.dispatch(MapEvent.java:226)
    at com.tangosol.util.MapListenerSupport.fireEvent(MapListenerSupport.jav
    a:556)
    at com.tangosol.util.ObservableHashMap.dispatchEvent(ObservableHashMap.j
    ava:229)
    at com.tangosol.util.ObservableHashMap$Entry.onAdd(ObservableHashMap.jav
    a:270)
    at com.tangosol.util.SafeHashMap.put(SafeHashMap.java:244)
    at com.tangosol.coherence.component.util.ServiceConfig$Map.put(ServiceCo
    nfig.CDB:43)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.g
    rid.partitionedService.PartitionedCache$StorageIdRequest.onReceived(PartitionedC
    ache.CDB:45)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.G
    rid.onMessage(Grid.CDB:11)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.G
    rid.onNotify(Grid.CDB:33)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.g
    rid.PartitionedService.onNotify(PartitionedService.CDB:3)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.g
    rid.partitionedService.PartitionedCache.onNotify(PartitionedCache.CDB:3)
    at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
    at java.lang.Thread.run(Thread.java:619)
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    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at com.tangosol.util.ExternalizableHelper.loadClass(ExternalizableHelper
    .java:3011)
    at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2421)
    ... 22 more
    2010-11-11 09:55:41.631/232.233 Oracle Coherence GE 3.6.0.0 <D5> (thread=Distrib
    utedCache, member=1): 3> Transferring primary PartitionSet{0, 1, 2, 3, 4, 5, 6,
    7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
    28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
    48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
    68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
    88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 1
    06, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 1
    22, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 1
    38, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 1
    54, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 1
    70, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 1
    86, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 2
    02, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 2
    18, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 2
    34, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 2
    50, 251, 252, 253, 254, 255, 256} to member 2 requesting 128
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    78, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 1
    94, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 2
    10, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 2
    26, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 2
    42, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256} to mem
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    rid.partitionedService.PartitionedCache$Storage.moveResourcesToPrimary(Partition
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    rid.partitionedService.PartitionedCache$Storage.movePartition(PartitionedCache.C
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    import java.util.Iterator;
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    import java.util.Map;
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              PreparedStatement pStmt = null;
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              Employee employee = null;
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                   con = getConnection();
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                   while(rSet.next()) {
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                        employee.setEmpAddr(rSet.getString("address"));
                        empMap.put(employee.getEmpId(), employee);
              } catch(Exception e) {
                   e.printStackTrace();
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                   try {
                        if(rSet != null)
                             rSet.close();
                        if(pStmt != null)
                             pStmt.close();
                        if(con != null)
                             con.close();
                   } catch(Exception e) {
                        e.printStackTrace();
              return empMap;
         public Iterator keys() {
              Connection con = null;
              PreparedStatement pStmt = null;
              ResultSet rSet = null;          
              List returnList = null;
              try {
                   con = getConnection();
                   pStmt = con.prepareStatement("select emp_id from emp_addr_view");
                   rSet = pStmt.executeQuery();
                   returnList = new LinkedList();
                   while(rSet.next()) {
                        returnList.add(rSet.getString("empId"));
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                   e.printStackTrace();
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                   try {
                        if(rSet != null)
                             rSet.close();
                        if(pStmt != null)
                             pStmt.close();
                        if(con != null)
                             con.close();
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                        e.printStackTrace();
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    cache-server.cmd added lines
    ============================
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    JVM arguments for running Client Program : DatabaseCache.java
    =======================================
    -Dtangosol.coherence.cacheconfig=E:\bea\user_projects\workspaces\workSpaceStudio\coh\cache-config.xml
    -Dtangosol.coherence.cluster=mycluster
    -Dtangosol.coherence.clusteraddress=224.0.0.1
    -Dtangosol.coherence.clusterport=5455
    ==================================================================================================
    Please do let me know if you require further information.
    Thanks
    Karthik

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    -JuContent-Description: Card for Deyan D. Bektchiev
    begin:vcard
    n:Bektchiev;Deyan
    tel;home:1-650-363-6055
    tel;work:1-650-289-1046
    x-mozilla-html:TRUE
    url:http://www.appl.net/
    org:Application Networks
    adr:;;444 Ramona St;Palo Alto;CA;94301;USA
    version:2.1
    email;internet:[email protected]
    fn:Deyan D. Bektchiev
    end:vcard

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