Virtual class vs. interface
hi,
i want to know the difference between virtual clas and interface ? I know that in Java we have virtual methods.but is there any virtual class kind of concept(like C++)?
1) don't post beginner question in the Java Programming forum. There's a {forum:id=921} forum for that purpose.
2) You should start by reading the Java tutorial; see for example this section: http://download.oracle.com/javase/tutorial/java/javaOO/index.html
is there any virtual class kind of concept3) Yes there is, those are called abstract classes
EDIT: should have closed my big gob, it looks like C++ virtual base classes are a specific construct meant for multiple inheritance. So no, Java hasn't this concept. But given the confusion of terms, as pointed out by ejp, I thought you meant classes which do allow "pure virtual methods", for which Java's closest equivalent are, definitely, astract classes .
EDIT: well, Java also has interfaces , which only allow declaring abstract (pure virtual) methods, so my reply is getting all the more fuzzy...
Going ejp's way now, can you rephrase the question, with a more accurate wording?
Regards,
J.
Edited by: jduprez on May 13, 2011 9:58 AM
Oops, corrected link to NTJ forum
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org.apache.jasper.JasperException: Unable to compile class for JSP
Generated servlet error:
/home/sherali/.netbeans/5.5/apache-tomcat-5.5.17_base/work/Catalina/localhost/UVSDataSearch/org/apache/jsp/pager_002ddemo_jsp.java:7: 'class' or 'interface' expected
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^
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SAP XI Lookup API: the Killer
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The error is: com.sap.engine.services.servlets_jsp.server.jsp.exceptions.CompilingException: Error in executing the compilation process: [ Compilation Failed! Exit Code=1
Command line executed: D:\usr\sap\CED\J00\exe\sapjvm_5\bin\\javac -source 1.5 -target 1.5 -encoding UTF-8 -d "D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\servlet_jsp\EmployeeWeb\work" -sourcepath "D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\servlet_jsp\EmployeeWeb\work\;" -classpath ".;D:\usr\sap\CED\J00\exe\jstartup.jar;D:\usr\sap\CED\J00\exe\sapjvm_5\lib\jvmx.jar;D:\usr\sap\CED\J00\exe\jre\lib\iqlib.jar;D:\usr\sap\CED\J00\exe\sapjvm_5\lib\tools.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\boot\sap.com~tc~bl~jkernel_boot~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\boot\jaas.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~bytecode~library.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\boot\memoryanalyzer.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\jperflib.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\jta.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~bytecode~library.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~cache_api~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~frame~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~gui~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~iqlib~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jdsr~jdsr.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_cache~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_classload~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_cluster~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_configuration~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_database~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_licensing~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_locking~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_log~api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_pool~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_service~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_thread~frame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~jkernel_util~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~bl~opensqlkernel~implOpenSQLFrame.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~exception~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~je~sessionmgmt~api_assembly.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~logging~java~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\sap.com~tc~logging~java~implPerf.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\system\vmc_storage_provider.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\timeout\sap.com~tc~je~timeout~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\servlet\servlet.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\cross_api\sap.com~tc~je~cross_api~API.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~antlr~runtime.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~bl~config~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~bl~cpt~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~bl~jarm~jarm.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~bl~opensqlkernel~implOpenSQL.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~bl~opensqlkernel~implOpenSQLPort.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~dd~db~dictionarydatabase~implDictionaryDatabase.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~je~bootstrap_core_lib~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\core_lib\sap.com~tc~sec~secstorefs~java~core.jar;D:\usr\sap\CED\J00\exe\mssjdbc\sqljdbc.jar;D:\usr\sap\CED\SYS\global\security\lib\engine\iaik_jce.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\log\sap.com~tc~je~log_api~API.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\mail-activation-iaik\mail.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\mail-activation-iaik\sap.com~tc~je~javamail_lib~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\mail-activation-iaik\activation.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\mail-activation-iaik\iaik_jsse.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\mail-activation-iaik\iaik_smime.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\mail-activation-iaik\iaik_ssl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\mail-activation-iaik\w3c_http.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.security.api.sda\sap.com~tc~sec~ume~api~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.security.api.sda\sap.com~tc~sec~ume~perm~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\security_api\sap.com~tc~je~security_api~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\shell\sap.com~tc~je~shell_api~API.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\cross\sap.com~tc~je~cross~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\visual_administration\sap.com~tc~bl~visual_administration~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\shell\sap.com~tc~je~shell~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\p4\sap.com~tc~je~p4~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\sapxmltoolkit\sap.com~tc~sapxmltoolkit~sapxmltoolkit.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jts\jts.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~jmx\sap.com~tc~bl~pj_jmx~Impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~mmodel~lib\sap.com~tc~je~mmodel~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\appcontext_api\sap.com~tc~je~appcontext_api~API.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\naming\sap.com~tc~je~naming~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\j2eeca\connector.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\idl\idl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\resourceset_api\sap.com~tc~bl~resourceset~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\resourcecontext_api\sap.com~tc~bl~resourcecontext~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~txmanager~plb\sap.com~tc~bl~txmanagerimpl~plb~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\transactionext_api\sap.com~tc~bl~transactionext~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\ts\sap.com~tc~je~ts~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\csiv2_api\sap.com~tc~bl~csiv2~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\iiop\sap.com~tc~je~iiop~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\file\sap.com~tc~je~file~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.tc.Logging\sap.com~tc~logging~standard~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~bcanalysis\sap.com~tc~je~bcanalysis~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~reference_graph\lib\tc~bl~reference_graph_api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\container_api\sap.com~tc~je~container_api~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\webservices\sap.com~tc~je~webservices_api~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.util.monitor.jarm\sap.com~tc~bl~jarmsat~jarmsat.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~i18n~verify~intf\sap.com~tc~i18n~verify~intf~jar~IMPL.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~i18n~cp\sap.com~tc~i18n~cp~jar~IMPL.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~i18n~decfloat\sap.com~tc~i18n~decfloat~jar~IMPL.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~com.sap.conn.jco\sap.com~tc~bl~jco_sapj2ee~runtime.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.mw.jco\sap.com~tc~bl~jrfc~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\keystore_api\sap.com~tc~je~keystore_api~API.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\tc~sec~certrevoc~interface\sap.com~tc~sec~certrevoc~interface~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~https~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~compat~core.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~ssf~core.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~jaas~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~saml~toolkit~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~csi~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~util0~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~userstore~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~xmlbind~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\security.class\sap.com~tc~sec~destinations~lib~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.guid\sap.com~tc~bl~guidgenerator~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\stax_api\jsr173_1.0_api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\stax_api\sjsxp.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jaxb20\jaxb-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jaxb20\jaxb-xjc.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jaxb20\jaxb-impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\saaj13\saaj-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\saaj13\saaj-impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jaxws_api\jaxws-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jws_api\jsr181-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\javax~annotation~api\annotation-api-1.0.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\compilation_lib\sap.com~tc~bl~compilation~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~base_webservices_lib\sap.com~tc~bl~base_webservices_lib.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~base_webservices_lib\jaxm-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~base_webservices_lib\jaxrpc-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~base_webservices_lib\jaxr-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~base_webservices_lib\jaxws-rt.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~base_webservices_lib\jaxws-tools.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~j2eedescriptors~lib\sap.com~tc~je~j2eedescriptors~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~ejb~metadata~model\lib\sap.com~tc~bl~ejb~metadata~model.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\javax~persistence~api\persistence-api-1.0.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\ejbormapping_api\sap.com~tc~je~ejbormapping_api~API.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~orpersistence~metadata~model\sap.com~tc~bl~orpersistence~metadata~model.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~util.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlin~core.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlinee~lib.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlinee~ear.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlinee~connector.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlinee~web.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlinee~ejb.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlinee~appclient.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jlinee~lib\sap.com~tc~jtools~jlinee~orpersistence.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\deploy\sap.com~tc~je~deploy~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\jmx_notification\sap.com~tc~je~jmx_notification~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\runtimeinfo\sap.com~tc~je~runtimeinfo~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\jmx\sap.com~tc~je~jmx~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\jmx\sap.com~tc~je~jmx~impl~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\http\sap.com~tc~je~httpserver~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~exprlang~plb\jee5_el.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jstl\jstl-1_2.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~injection~lib\lib\private\tc~je~injection.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jsf\lib\ec~java~jsf_api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jsf\lib\ec~java~jsf~tld.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jsf\lib\private\com-sun-commons-beanutils.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jsf\lib\private\com-sun-commons-collections.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jsf\lib\private\com-sun-commons-digester.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jsf\lib\private\com-sun-commons-logging-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ec~java~jsf\lib\private\ec~java~jsf_core.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~je~jacc~plb\jacc-1_1-fr-class.zip;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\classpath_resolver\sap.com~tc~je~classpath_resolver~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.ip.basecomps\sap.com~tc~bl~basecomps~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\sdo\lib\sap.com~sdo.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\sdo\lib\sap.com~sdo~api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\sdo\lib\sap.com~sdo~api~extension.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ejb_api\ejb-3_0-api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\webservices_lib\sap.com~tc~je~webservices_lib~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~i18n~saptimezone\sap.com~tc~i18n~saptimezone~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~i18n~cpbase\sap.com~tc~i18n~cpbase~jar~IMPL.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.security.core.sda\sap.com~tc~sec~ume~core~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.security.core.sda\sap.com~tc~sec~ume~tpd~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jms\jms.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\jms\jmsclient.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\com.sap~tc~je~jmsapi\sap.com~tc~je~jmsapi~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\userstore\sap.com~tc~je~userstore~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~SL~utility\sap.com~tc~bl~sl~utility~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\com.sap.exception\sap.com~tc~exception~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc~bl~jarsap~sda\sap.com~tc~bl~jarsap~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\tc~bl~deploy_api\sap.com~tc~bl~deploy~api.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\tc.httpclient\sap.com~tc~clients~http~all.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\tc~sec~destinations~interface\sap.com~tc~sec~destinations~interface_api~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\endpoint_api\sap.com~tc~bl~endpoint~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\connector\sap.com~tc~je~connector~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\antlr\sap.com~tc~antlr~runtime.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\dbpool\sap.com~tc~je~dbpool~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\tc~sec~destinations~provider\sap.com~tc~sec~destinations~provider~java~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\com.sap.security.core.ume.service\sap.com~tc~sec~ume~service~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\sap.com~tc~je~constants~lib\lib\tc~je~constants.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\schemaprocessor~srv\sap.com~tc~je~schemaprocessor.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\tc~je~webcontainer~api\sap.com~tc~je~webcontainer~webcontainer_api_impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\servlet_jsp\sap.com~tc~je~webcontainer~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\objectProfiler\sap.com~tc~bl~objectProfiler~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\tc~je~cachemgmt~srv\sap.com~tc~je~cachemgmt~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\locking\sap.com~tc~je~locking~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\configuration\sap.com~tc~je~configuration~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\basicadmin\sap.com~tc~je~basicadmin~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\basicadmin\jstartupapi.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\basicadmin\jstartupimpl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\adminadapter\sap.com~tc~je~adminadapter~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\security\sap.com~tc~je~security~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\applocking\sap.com~tc~je~applocking~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ejb20\ejb20.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ejbqlparser\sap.com~tc~bl~ejbqlparser~lib.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\ejbqlparser\sap.com~tc~bl~ejbqlparser_3_0~lib.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\sqlmapper\sap.com~tc~bl~ejbsqlmapper~implCommonSQLMapper.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\sqlmapper\sap.com~tc~bl~ejbsqlmapper~implSQLMapperAPI.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\interfaces\ejbmonitor_api\sap.com~tc~bl~ejbmonitor~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\services\ejb\sap.com~tc~je~ejb~impl.jar;D:\usr\sap\CED\J00\j2ee\cluster\bin\ext\orpersistence_client_lib\lib\orpersistence_client_lib_api.jar;D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\orpersistence\jars\EmployeeEjb.jar;D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\EJBContainer\applicationjars\EmployeeEjb.jar;D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\servlet_jsp\EmployeeWeb\work;;" -nowarn -g ["D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\servlet_jsp\EmployeeWeb\work\JEE_jsp_index_8832250_1231538390011_1231538444324.java"]
Error stream contains:"D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\servlet_jsp\EmployeeWeb\work\JEE_jsp_index_8832250_1231538390011_1231538444324.java:16: 'class' or 'interface' expected
import javax.servlet.*;
^
D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\servlet_jsp\EmployeeWeb\work\JEE_jsp_index_8832250_1231538390011_1231538444324.java:17: 'class' or 'interface' expected
import javax.servlet.http.*;
^
D:\usr\sap\CED\J00\j2ee\cluster\apps\sap.com\EmployeeEar\servlet_jsp\EmployeeWeb\work\JEE_jsp_index_8832250_1231538390011_1231538444324.java:18: 'class' or 'interface' expected
import javax.servlet.jsp.*;
^
3 errors
"].005056841108002A00000070000007AC0139C8D8862D3EED Date: 2009-01-09 Time: 23:00:45:042 Category: /System/Server/WebRequests Location: com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl Application: sap.com/EmployeeEar Thread: HTTP Worker [4] Data Source: j2ee\cluster\server0\log\system\server_00.log Correlator ID: 88322500000038637 Argument Objects: Arguments: DSR Component: n.a. DSR Transaction: 10c493a0de9311dd9631005056841108 DSR User: Message Code: Session: 979 Transaction: User: Guest Host: IMGNWCED System: CED Instance: J00 Node: server0
As you can see there is some compilation error, it says 3 times "'class' or 'interface' expected". If i remove all the relevant EJB java code from my index.jsp everything works fine. So I guess there must be some problem with finding the resources. Unfortunately this "logging" is not helpful at all (thank you SAP!). In NWDS everything is fine no problems at all!!!
Who can help me here with this?
Thanks in AdvanceI have found the issue.
in the index.jsp I have the following lines:
<!-- Import Statements -->
<%@ page import="javax.naming.InitialContext" %>
<%@ page import="com.sap.demo.session.EmployeeServicesLocal;" %>
Now check the end of the second import ==> ;
Removing the semicolon solves the issue. But the SAP error message is still not very helpful to me. -
Compiling Nested Classes and Interfaces
I am looking for documentation about compiling nested classes and interfaces. I have found something in the JVM Specification, but there does not explain how a nested class is compiled and what is included in the top level class to mark a "place holder" to the nested class. The JVM Specification in this topic cite the web page http://java.sun.com/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc.html that does not exists any more.
My root problem is that: I am compiling a class with a private nested class, but in the class file generated TopLevelClass$NestedClass.class the class does not have the private modifier. So I am not understanding why the "private" modifier was removed during compilation.
I performed the same test with a protected nested class and the result was the nested class with the public modifier. So I am not understanding why the "protected" modifier was changed to "public".
Thanks in advance,
Mardoqueu.This should not be happening. What compiler are you using? If it's a reasonably recent Sun compiler, could you post a minimal example?
-
Error like 'class' or 'interface' expected
hi,
I write one simple program :-
enum Apple
a,b,c;
public class AppleDemo
public static void main(String args[])
Apple app;
app=Apple.a;
System.out.println("The Apple is:"+app);
app=Apple.b;
if(app==Apple.b)
System.out.println("Apple is:"+app);
}My qry is- I am trying to compile this program.I am using j2sdk1.5.0 for compilation...but i got error that is
*'class' or 'interface' expected*
Thanks in advance.This forum is for Sun Instant Messaging related questions. For simple java questions I suggest you refer to the following forum:
http://forums.sun.com/forum.jspa?forumID=54
Regards,
Shane. -
Hi,
I have to buid a report in ECM with complete details of the engineering as well as production. This include workflow as well as various fucntionality depends upon the criterion and user's event.
I am implementating in OOPS and I Want to know that when I should use the Abstract class and when interface ?
Because as per me both serve the same purpose. Kindly send me the exact difference so that i can efficiently use the same.
Thanks
PrinceWhen inheriting A Interface We have to inherit all the methods of the Interface there's no other option whereas with abstract classes we can inherit the members that we are in need of.
Just the interface has to have body of the method and the method is to be used by the classes inheriting it. Whereas in the case of Abstract Class it can have declarations (Other than the abstract method) and it can be further extended in the classes inheriting the Abstract Class.
Interface contains all abstract methods,all methods compulsory implemented by particular class, interface does not contain Constructor
abstract classes are designed with implemantion gaps for sub-class to fill in.
interfaces are sintacticlly similar to classes but they lack insance variables & methods.
abstract classes can also have both abstract methods & non-abstract methods. where as in interface methods are abstract only, & variables are implicitly static&final
regards
Preetesh -
I am very new to java and need to do an assignment for my course. I am trying to get a connection to a database and retrieve information but I get the below error when I try to compile my program - any ideas?
D:\javawork\Bike.java:16: 'class' or 'interface' expected
public Bike()
^
Here is the actual code:
//Bike Class
import java.sql.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;
import java.lang.*;
public class Bike extends JFrame
private Connection Database;
private JTable table;
public Bike()
// Use JDBC to connect to a Microsoft ODBC source
String url = "jdbc:odbc:Mikesdb";
String username = "guest";
String password = "guest";
Statement DataRequest;
ResultSet Results;
//Load the driver to allow connection to the database
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Database = DriverManager.getConnection(url);
System.out.println("Successful Connection" + Database);
catch(ClassNotFoundException cnferr)
System.err.println("Failed to load JDBC/ODBC bridge" + cnferr);
System.exit(1); //exit program
catch(SQLException sqlex)
System.err.println("Unable to connect to the database" + sqlex);
System.exit(2); //exit program
FindBike();
setSize(200,200);
show();
public void FindBike(String type, String gender, String status)
String t = type;
String g = gender;
String s = status;
this.getConnection();
Statement DataRequest;
ResultSet Results;
try
//get user input for three fields in future
String query = "Select * FROM Bike WHERE Status = 'Ready'";
DataRequest = Database.createStatement();
Results = DataRequest.executeQuery (query);
displayResults (Results);
DataRequest.close();
catch(SQLException err)
System.out.println("SQL Error: " + err);
System.exit(3);
public void Disconnect()
try
Database.close();
catch(SQLException err)
System.out.println("Cannot close database connection: " + err);
System.exit(4);
public static void main(String[] arguments) {
Bike b = new Bike();
b.show();
Having moved the { to the end I get lots of new errors!
D:\javawork\Bike.java:49: FindBike(java.lang.String,java.lang.String,java.lang.String) in Bike cannot be applied to ()
FindBike();
^
D:\javawork\Bike.java:60: cannot resolve symbol
symbol : method getConnection ()
location: class Bike
this.getConnection();
^
D:\javawork\Bike.java:71: cannot resolve symbol
symbol : method DisplayResults (java.sql.ResultSet)
location: class Bike
DisplayResults (Results);
^
3 errors
Finished -
Class or interface could not be loaded?
I am very new to coding in general, ini fact this is my fisrt crack at it, and right now I'm just going off a tutorial, but for whatever reason i'm having an issue that the class/interface not being loaded.
My code right now is:
class ship extends MovieClip
var velocity;
function onLoad()
velocity = 10;
function onEnterFrame()
_x = _x + velocity;
Essentailly when I test play this i should see my object going across the screen, but instead it does nothing and i get the error:
"Symbol=Ship, layer=1, frame=1, Line 1 The class or interface 'Ship' could not be loaded."
I do have the .fla and .as saved in the same file, but does it matter where that file is located, or have I come across some basic mistake or..?
I'm using ActionScript2.0 for this.
(Very secondary, but does anybody have any tutorial reccomendations?)You have the .fla and .as saved in the same file? Or the same folder?
Also you will notice that you have
class ship extends MovieClip
But it looks like for your symbol you have given it a defintion of Ship. (Caps matter!)
Your code should be capitalized, as should the name of the Ship.as file. You will notice that the Flash classes all start with a cap and that instances start with lowercase letters. You don't have to do this, but it makes it easier to know what is what.
As a recommendation I would recommend the book by Keith Peters, Making things move. And also unless you have an overwhelming need to learn AS2, I would recommend skipping it and moving right to AS3. -
Urgent: 'Class' or 'interface' expected
Hello,
I am working on a piece of work which has to be in for tomorrow, i have been trying to compile it for so,me time now and everytime i try it says 'Class' or 'interface' expected.
I have not finished writing the program and i am not sure how correct it is. Any help would be much appreciated,
Thank you,
James
Error Message: -
U:\ManXP\My Documents\myjava>javac emailclient2.java
emailclient2.java:181: 'class' or 'interface' expected
private static int readListFromFile(String filename, Message[]
^
messageList, int maxLines)
1 errorI am working on a piece of work which has to be in
for tomorrow, i have been trying to compile it for
so,me time now and everytime That's quite a bit of superfluous information. Please don't mark your questions as urgent. Thanks!
i try it says 'Class' or 'interface' expected.You've got a syntax error in your code on line 181. Look at the lines before that. Are you trying to declare that method inside another method?
Careful adherence to standard Code Conventions for the Java� Programming Language can make this type of problem very easy to spot... -
JDeveloper Error(16,8) 'class' or 'interface' expected
I have just installed JDeveloper for 11.5.10 RUP5 OA Framework and extended the Purchase Requisition Lines EO (PoRequisitionLineEO). Everything seemed to work okay. However, in the first step of deployment, to compile the .java class, when I select Make rnPoRequisitionLineEOImpl.java, I receive the following compiler eror:
Error(16,8): 'class' or 'interface' expected
My sense is that this may be an environment setup issue as this is the first time I'm using JDeveloper and the first time I am extending OA Framework.
Any advice on how to resolve?
Edited by: Kit on Jan 29, 2010 2:42 PMThis was an end-user error. Additional code had been added to the .java source code that was not in a class.
-
Error ::::: Box.java:2: 'class' or 'interface' expected
Hey ...this is sample program from "java 2 fourth edition by herbert schildt"
Class Box()
double width;
double height;
double depth;
//display volume of the box
void volume() {
System.out.print("Volume is");
System.out.println(width * height * depth);
Class BoxDemo3
public static void main(String args[])
Box mybox1 = new Box();
Box mybox2 = new Box();
//assign values to mybox1 instance variables
mybox1.width = 10;
mybox1.height = 20;
mybox1.depth = 15;
mybox2.width = 3;
mybox2.height = 6;
mybox2.depth = 9;
mybox1.volume();
mybox2.volume();
i have saved it as Box.java and using editplus i have compiled it then i got the error as
Error ::::: Box.java:2: 'class' or 'interface' expected
I think i have to import something in the code ......help me understand java
thanx alotclass, not Class
-
"class or interface expected error"
hi,
i have these two classes that am using and when i try and compile them i get a class or interface expected error.
i have looked at previous posts and checked that i have the right number of closed brackets.
anyone any ideas?
import java.io.*;
import java.net.*;
public class BookingServer {
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = null;
Socket mysocket = null;
try {
serverSocket = new ServerSocket(4444);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed.");
System.exit(1);
PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String inputLine, outputLine;
BookingProtocol bp = new BookingProtocol();
outputLine = bp.processInput(null);
out.println(outputLine);
while ((inputLine = in.readLine()) != null) {
out.println(inputLine);
outputLine = bp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("BYE"))
break;
out.close();
in.close();
clientSocket.close();
serverSocket.close();
*****************PROTOCOL***********************
import java.io.*;
import java.net.*;
public class BookingProtocol {
private static final int WAITING = 0;
private static final int SENTLOGON = 1;
private static final int SENTSEATREQ = 2;
private static final int SENTSTATUSREQ = 3;
private static final String LOGONPROMPT = "LOGON";
private static final String SEATPROMPT = "SEAT";
private static final String STATUSPROMPT = "STATUS";
private static final String BYEPROMPT = "BYE";
private int state = WAITING;
public String processInput(String theInput) {
String theOutput = null;
if (state == WAITING) {
theOutput = LOGONPROMPT;
state = SENTLOGON;
} else if (state == SENTLOGON) {
theOutput = SEATPROMPT;
state = SENTSEATREQ;
} else if (state == SENTSEATREQ) {
theOutput = STATUSPROMPT;
state = SENTSTATUSREQ;
} else if (state == SENTSTATUSREQ) {
theOutput = BYEPROMPT;
state = WAITING;
return theOutput;
in.close();
clientSocket.close();
serverSocket.close();you have too many }-brackets, the finalin.close();
clientSocket.close();
serverSocket.close();
}is not inside any class -
JSP Debbuging -Error: 'class' or 'interface' expected-
Hi,
Does anybody know why am I getting the following error when trying to either debug or run a JSP?
Error: 'class' or 'interface' expected
This happens with JDeveloper 9.0.2.829
It was running just OK, when running from the Navigator Panel (Right click -> Run test.jsp)
But, when I tried to run the JSP from the Debug Icon -that debugs the whole project-, I got the error I already mentioned.
Thanks in advance for your help
AgutinHi,
Does anybody know why am I getting the following error when trying to either debug or run a JSP?
Error: 'class' or 'interface' expected
This happens with JDeveloper 9.0.2.829
It was running just OK, when running from the Navigator Panel (Right click -> Run test.jsp)
But, when I tried to run the JSP from the Debug Icon -that debugs the whole project-, I got the error I already mentioned.
Thanks in advance for your help
Agutin
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