[java.net.connectexception: connection refused: connect while publishing data in to OER from JDeveloper

while publishing data in to OER from Jdeveloper 12c i got below error

introspect-project:
[repository.submit] failed to get authtoken due to: [{http://schemas.xmlsoap.org/soap/envelope/}server.userexception] [java.net.connectexception: connection refused: connect] [java.net.connectexception: connection refused: connect]
AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.net.ConnectException: Connection refused: connect
faultActor:
faultNode:
faultDetail:
{http://xml.apache.org/axis/}stackTrace:java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:153)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:120)
at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191)
at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404)
at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)
at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165)
at org.apache.axis.client.Call.invokeEngine(Call.java:2765)
at org.apache.axis.client.Call.invoke(Call.java:2748)
at org.apache.axis.client.Call.invoke(Call.java:2424)
at org.apache.axis.client.Call.invoke(Call.java:2347)
at org.apache.axis.client.Call.invoke(Call.java:1804)
at com.flashline.registry.openapi.service.v300.FlashlineRegistryTrSoapBindingStub.authTokenCreateWithLicense(FlashlineRegistryTrSoapBindingStub.java:7646)
at com.oracle.oer.sync.plugin.writer.oer.ALERConnectionCache.getAuthToken(ALERConnectionCache.java:136)
at com.oracle.oer.sync.plugin.writer.oer.ALERAssetQueries.getToken(ALERAssetQueries.java:82)
at com.oracle.oer.sync.plugin.writer.oer.ALERAssetQueries.assetTypeQueryByUUID(ALERAssetQueries.java:172)
at com.oracle.oer.sync.framework.MetadataManager.putAssetType(MetadataManager.java:206)
at com.oracle.oer.sync.framework.impl.DefaultPluginManager.processIntrospector(DefaultPluginManager.java:105)
at com.oracle.oer.sync.framework.impl.DefaultPluginManager.<init>(DefaultPluginManager.java:74)
at com.oracle.oer.sync.framework.MetadataManager.init(MetadataManager.java:308)
at com.oracle.oer.sync.framework.ant.IntrospectTask.createMetadataManager(IntrospectTask.java:404)
at com.oracle.oer.sync.framework.ant.IntrospectTask.getMetadataManager(IntrospectTask.java:389)
at com.oracle.oer.sync.framework.ant.IntrospectTask.performRepositoryWork(IntrospectTask.java:346)
at com.oracle.oer.sync.framework.ant.RepositoryTaskBase.execute(RepositoryTaskBase.java:182)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
at org.apache.tools.ant.Main.runBuild(Main.java:851)
at org.apache.tools.ant.Main.startAnt(Main.java:235)
at org.apache.tools.ant.Main.start(Main.java:198)
at org.apache.tools.ant.Main.main(Main.java:286)

{http://xml.apache.org/axis/}hostname:XXXX

java.net.ConnectException: Connection refused: connect
at org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:154)
at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165)
at org.apache.axis.client.Call.invokeEngine(Call.java:2765)
at org.apache.axis.client.Call.invoke(Call.java:2748)
at org.apache.axis.client.Call.invoke(Call.java:2424)
at org.apache.axis.client.Call.invoke(Call.java:2347)
at org.apache.axis.client.Call.invoke(Call.java:1804)
at com.flashline.registry.openapi.service.v300.FlashlineRegistryTrSoapBindingStub.authTokenCreateWithLicense(FlashlineRegistryTrSoapBindingStub.java:7646)
at com.oracle.oer.sync.plugin.writer.oer.ALERConnectionCache.getAuthToken(ALERConnectionCache.java:136)
at com.oracle.oer.sync.plugin.writer.oer.ALERAssetQueries.getToken(ALERAssetQueries.java:82)
at com.oracle.oer.sync.plugin.writer.oer.ALERAssetQueries.assetTypeQueryByUUID(ALERAssetQueries.java:172)
at com.oracle.oer.sync.framework.MetadataManager.putAssetType(MetadataManager.java:206)
at com.oracle.oer.sync.framework.impl.DefaultPluginManager.processIntrospector(DefaultPluginManager.java:105)
at com.oracle.oer.sync.framework.impl.DefaultPluginManager.(DefaultPluginManager.java:74)
at com.oracle.oer.sync.framework.MetadataManager.init(MetadataManager.java:308)
at com.oracle.oer.sync.framework.ant.IntrospectTask.createMetadataManager(IntrospectTask.java:404)
at com.oracle.oer.sync.framework.ant.IntrospectTask.getMetadataManager(IntrospectTask.java:389)
at com.oracle.oer.sync.framework.ant.IntrospectTask.performRepositoryWork(IntrospectTask.java:346)
at com.oracle.oer.sync.framework.ant.RepositoryTaskBase.execute(RepositoryTaskBase.java:182)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
at org.apache.tools.ant.Main.runBuild(Main.java:851)
at org.apache.tools.ant.Main.startAnt(Main.java:235)
at org.apache.tools.ant.Main.start(Main.java:198)
at org.apache.tools.ant.Main.main(Main.java:286)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:153)
at org.apache.axis.components.net.DefaultSocketFactory.create(DefaultSocketFactory.java:120)
at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191)
at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404)
at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)
... 38 more
[repository.submit] An error occurred performing the Repository operation:
[repository.submit] com.oracle.oer.sync.framework.MetadataIntrospectionException: com.oracle.oer.sync.framework.MetadataIntrospectionException: Unable to read plugin file: C:\Oracle\Middleware\Oracle_Home\jdeveloper\harvester\plugins\biz.introspector

The reason for the error was that the oer managed server was not properly up and running.

I restarted the admin server and OER managed server and i was then able to resolve this issue.

Make sure OER server is up and running before you run the wizard to publish the artifacts to OER From JDeveloper