Some minor problems with hibernate

The two tables are a one-to-many mapping relationship, and errors that occur when a foreign key constraint is established in the table. As long as the table when the corresponding foreign key constraints removed it is OK.

Two tables are:

CREATE TABLE Cst_customer (
  cust_id number not NULL,
  cust_name varchar () NOT NULL,
  Cust_source varchar (32) Default NULL,
  cust_industry varchar () default NULL,
  cust_level varchar () default NULL,
  Cust_phone varchar () default NULL,
  cust_mobile varchar () default NULL,
  PRIMARY KEY (cust_id)
);

CREATE TABLE Cst_linkman (
  lkm_id number not NULL,
  lkm_name varchar () DEFAULT NULL,
  lkm_cust_id number (() not NULL,
  lkm_gender varchar2 (1) default NULL,
  lkm_phone varchar2 () default NULL,
  Lkm_mobile VARCHAR2 () default null,
  lkm_email varchar2 ($) default NULL,
  lkm_qq varchar2 () default NULL,
  lkm_ Position varchar2 default NULL,
  Lkm_memo varchar2 ($) default NULL,
  PRIMARY KEY (lkm_id),
  CONSTRAINT fk_cst_linkman_lkm_cust_id FOREIGN KEY (lkm_cust_id) REFERENCES Cst_customer (cust_id)
);

Org.hibernate.tool.schema.spi.SchemaManagementException:Unable to execute schema management to JDBC target [ALTER TABLE Cst_linkman add constraint fkh9yp1nql5227xxcopuxqx2e7q foreign key (lkm_cust_id) references Cst_customer (cust_id)] at or G.hibernate.tool.schema.internal.targetdatabaseimpl.accept (targetdatabaseimpl.java:59)
At Org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString (schemamigratorimpl.java:431)
At Org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings (schemamigratorimpl.java:420)
At Org.hibernate.tool.schema.internal.SchemaMigratorImpl.applyForeignKeys (schemamigratorimpl.java:386)
At Org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigrationToTargets (schemamigratorimpl.java:214)
At Org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration (schemamigratorimpl.java:60)
At Org.hibernate.tool.hbm2ddl.SchemaUpdate.execute (schemaupdate.java:133)
At Org.hibernate.tool.hbm2ddl.SchemaUpdate.execute (schemaupdate.java:101)
At Org.hibernate.internal.sessionfactoryimpl.<init> (sessionfactoryimpl.java:470)
At Org.hibernate.boot.internal.SessionFactoryBuilderImpl.build (sessionfactorybuilderimpl.java:444)
At Org.hibernate.cfg.Configuration.buildSessionFactory (configuration.java:708)
At Org.hibernate.cfg.Configuration.buildSessionFactory (configuration.java:724)
At Com.hibernate.tes.DayOne.test1 (dayone.java:15)
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.junit.runners.model.frameworkmethod$1.runreflectivecall (frameworkmethod.java:44)
At Org.junit.internal.runners.model.ReflectiveCallable.run (reflectivecallable.java:15)
At org.junit.runners.model.FrameworkMethod.invokeExplosively (frameworkmethod.java:41)
At Org.junit.internal.runners.statements.InvokeMethod.evaluate (invokemethod.java:20)
At Org.junit.runners.BlockJUnit4ClassRunner.runChild (blockjunit4classrunner.java:76)
At Org.junit.runners.BlockJUnit4ClassRunner.runChild (blockjunit4classrunner.java:50)
At Org.junit.runners.parentrunner$3.run (parentrunner.java:193)
At Org.junit.runners.parentrunner$1.schedule (parentrunner.java:52)
At Org.junit.runners.ParentRunner.runChildren (parentrunner.java:191)
At org.junit.runners.parentrunner.access$000 (parentrunner.java:42)
At Org.junit.runners.parentrunner$2.evaluate (parentrunner.java:184)
At Org.junit.runners.ParentRunner.run (parentrunner.java:236)
At Org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run (junit4testreference.java:86)
At Org.eclipse.jdt.internal.junit.runner.TestExecution.run (testexecution.java:38)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (remotetestrunner.java:459)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (remotetestrunner.java:675)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run (remotetestrunner.java:382)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main (remotetestrunner.java:192)
Caused by:java.sql.sqlexception:ora-02275: Such a reference constraint already exists in this table


At Oracle.jdbc.driver.DatabaseError.throwSqlException (databaseerror.java:112)
At Oracle.jdbc.driver.T4CTTIoer.processError (t4cttioer.java:331)
At Oracle.jdbc.driver.T4CTTIoer.processError (t4cttioer.java:288)
At Oracle.jdbc.driver.T4C8Oall.receive (t4c8oall.java:745)
At Oracle.jdbc.driver.T4CStatement.doOall8 (t4cstatement.java:210)
At Oracle.jdbc.driver.T4CStatement.executeForRows (t4cstatement.java:961)
At Oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout (oraclestatement.java:1190)
At Oracle.jdbc.driver.OracleStatement.executeUpdateInternal (oraclestatement.java:1657)
At Oracle.jdbc.driver.OracleStatement.executeUpdate (oraclestatement.java:1626)
At Com.mchange.v2.c3p0.impl.NewProxyStatement.executeUpdate (newproxystatement.java:208)
At Org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept (targetdatabaseimpl.java:56)
... More