Remove SQLExceptionHandler (#20205)

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/SQLDialectException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/SQLDialectException.java

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect;
+package org.apache.shardingsphere.error.exception;
 
 import org.apache.shardingsphere.infra.util.exception.ShardingSphereInsideException;
 

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/connection/TooManyConnectionsException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/connection/TooManyConnectionsException.java

@@ -15,9 +15,9 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.connection;
+package org.apache.shardingsphere.error.exception.connection;
 
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Too many connections exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/data/InsertColumnsAndValuesMismatchedException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/data/InsertColumnsAndValuesMismatchedException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.data;
+package org.apache.shardingsphere.error.exception.data;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Insert columns and values mismatched exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/data/InvalidParameterValueException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/data/InvalidParameterValueException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.data;
+package org.apache.shardingsphere.error.exception.data;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Invalid parameter value exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/syntax/database/DatabaseCreateExistsException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/syntax/database/DatabaseCreateExistsException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.syntax.database;
+package org.apache.shardingsphere.error.exception.syntax.database;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Database create exists exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/syntax/database/DatabaseDropNotExistsException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/syntax/database/DatabaseDropNotExistsException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.syntax.database;
+package org.apache.shardingsphere.error.exception.syntax.database;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Database drop exists exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/syntax/database/NoDatabaseSelectedException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/syntax/database/NoDatabaseSelectedException.java

@@ -15,9 +15,9 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.syntax.database;
+package org.apache.shardingsphere.error.exception.syntax.database;
 
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * No database selected exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/syntax/database/UnknownDatabaseException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/syntax/database/UnknownDatabaseException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.syntax.database;
+package org.apache.shardingsphere.error.exception.syntax.database;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Unknown database exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/syntax/table/NoSuchTableException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/syntax/table/NoSuchTableException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.syntax.table;
+package org.apache.shardingsphere.error.exception.syntax.table;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * No such table exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/syntax/table/TableExistsException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/syntax/table/TableExistsException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.syntax.table;
+package org.apache.shardingsphere.error.exception.syntax.table;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Table exists exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/transaction/InTransactionException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/transaction/InTransactionException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.transaction;
+package org.apache.shardingsphere.error.exception.transaction;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * In transaction exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/dialect/transaction/TableModifyInTransactionException.java → shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/exception/transaction/TableModifyInTransactionException.java

@@ -15,11 +15,11 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.error.dialect.transaction;
+package org.apache.shardingsphere.error.exception.transaction;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 
 /**
  * Table modify in transaction exception.

shardingsphere-error/shardingsphere-common-error/src/main/java/org/apache/shardingsphere/error/mapper/SQLDialectExceptionMapper.java

@@ -17,7 +17,7 @@
 
 package org.apache.shardingsphere.error.mapper;
 
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 import org.apache.shardingsphere.infra.util.spi.annotation.SingletonSPI;
 import org.apache.shardingsphere.infra.util.spi.type.typed.TypedSPI;
 

shardingsphere-error/shardingsphere-mysql-error/src/main/java/org/apache/shardingsphere/error/mysql/mapper/MySQLDialectExceptionMapper.java

@@ -17,16 +17,16 @@
 
 package org.apache.shardingsphere.error.mysql.mapper;
 
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
-import org.apache.shardingsphere.error.dialect.connection.TooManyConnectionsException;
-import org.apache.shardingsphere.error.dialect.data.InsertColumnsAndValuesMismatchedException;
-import org.apache.shardingsphere.error.dialect.syntax.database.DatabaseCreateExistsException;
-import org.apache.shardingsphere.error.dialect.syntax.database.DatabaseDropNotExistsException;
-import org.apache.shardingsphere.error.dialect.syntax.database.NoDatabaseSelectedException;
-import org.apache.shardingsphere.error.dialect.syntax.database.UnknownDatabaseException;
-import org.apache.shardingsphere.error.dialect.syntax.table.NoSuchTableException;
-import org.apache.shardingsphere.error.dialect.syntax.table.TableExistsException;
-import org.apache.shardingsphere.error.dialect.transaction.TableModifyInTransactionException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
+import org.apache.shardingsphere.error.exception.connection.TooManyConnectionsException;
+import org.apache.shardingsphere.error.exception.data.InsertColumnsAndValuesMismatchedException;
+import org.apache.shardingsphere.error.exception.syntax.database.DatabaseCreateExistsException;
+import org.apache.shardingsphere.error.exception.syntax.database.DatabaseDropNotExistsException;
+import org.apache.shardingsphere.error.exception.syntax.database.NoDatabaseSelectedException;
+import org.apache.shardingsphere.error.exception.syntax.database.UnknownDatabaseException;
+import org.apache.shardingsphere.error.exception.syntax.table.NoSuchTableException;
+import org.apache.shardingsphere.error.exception.syntax.table.TableExistsException;
+import org.apache.shardingsphere.error.exception.transaction.TableModifyInTransactionException;
 import org.apache.shardingsphere.error.mapper.SQLDialectExceptionMapper;
 import org.apache.shardingsphere.error.mysql.code.MySQLVendorError;
 import org.apache.shardingsphere.infra.util.exception.sql.UnknownSQLException;

shardingsphere-error/shardingsphere-postgresql-error/src/main/java/org/apache/shardingsphere/error/postgresql/mapper/PostgreSQLDialectExceptionMapper.java

@@ -19,12 +19,12 @@
 
 import org.apache.shardingsphere.error.mapper.SQLDialectExceptionMapper;
 import org.apache.shardingsphere.error.postgresql.code.PostgreSQLVendorError;
-import org.apache.shardingsphere.error.dialect.transaction.InTransactionException;
-import org.apache.shardingsphere.error.dialect.data.InsertColumnsAndValuesMismatchedException;
-import org.apache.shardingsphere.error.dialect.data.InvalidParameterValueException;
-import org.apache.shardingsphere.error.dialect.connection.TooManyConnectionsException;
-import org.apache.shardingsphere.error.dialect.syntax.database.DatabaseCreateExistsException;
-import org.apache.shardingsphere.error.dialect.SQLDialectException;
+import org.apache.shardingsphere.error.exception.transaction.InTransactionException;
+import org.apache.shardingsphere.error.exception.data.InsertColumnsAndValuesMismatchedException;
+import org.apache.shardingsphere.error.exception.data.InvalidParameterValueException;
+import org.apache.shardingsphere.error.exception.connection.TooManyConnectionsException;
+import org.apache.shardingsphere.error.exception.syntax.database.DatabaseCreateExistsException;
+import org.apache.shardingsphere.error.exception.SQLDialectException;
 import org.postgresql.util.PSQLException;
 import org.postgresql.util.PSQLState;
 

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/main/java/org/apache/shardingsphere/sharding/route/engine/condition/engine/impl/InsertClauseShardingConditionEngine.java

@@ -25,7 +25,7 @@
 import org.apache.shardingsphere.infra.binder.statement.dml.SelectStatementContext;
 import org.apache.shardingsphere.infra.datetime.DatetimeService;
 import org.apache.shardingsphere.infra.datetime.DatetimeServiceFactory;
-import org.apache.shardingsphere.error.dialect.data.InsertColumnsAndValuesMismatchedException;
+import org.apache.shardingsphere.error.exception.data.InsertColumnsAndValuesMismatchedException;
 import org.apache.shardingsphere.infra.exception.ShardingSphereException;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
 import org.apache.shardingsphere.sharding.route.engine.condition.ExpressionConditionUtils;

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/main/java/org/apache/shardingsphere/sharding/route/engine/validator/ddl/ShardingDDLStatementValidator.java

@@ -20,8 +20,8 @@
 import org.apache.shardingsphere.infra.exception.ShardingSphereException;
 import org.apache.shardingsphere.infra.metadata.database.schema.decorator.model.ShardingSphereSchema;
 import org.apache.shardingsphere.infra.route.context.RouteContext;
-import org.apache.shardingsphere.error.dialect.syntax.table.NoSuchTableException;
-import org.apache.shardingsphere.error.dialect.syntax.table.TableExistsException;
+import org.apache.shardingsphere.error.exception.syntax.table.NoSuchTableException;
+import org.apache.shardingsphere.error.exception.syntax.table.TableExistsException;
 import org.apache.shardingsphere.sharding.route.engine.validator.ShardingStatementValidator;
 import org.apache.shardingsphere.sharding.rule.ShardingRule;
 import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.index.IndexSegment;

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/test/java/org/apache/shardingsphere/sharding/route/engine/condition/engine/InsertClauseShardingConditionEngineTest.java

@@ -21,7 +21,7 @@
 import org.apache.shardingsphere.infra.binder.segment.insert.values.InsertSelectContext;
 import org.apache.shardingsphere.infra.binder.segment.insert.values.InsertValueContext;
 import org.apache.shardingsphere.infra.binder.statement.dml.InsertStatementContext;
-import org.apache.shardingsphere.error.dialect.data.InsertColumnsAndValuesMismatchedException;
+import org.apache.shardingsphere.error.exception.data.InsertColumnsAndValuesMismatchedException;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
 import org.apache.shardingsphere.sharding.route.engine.condition.ShardingCondition;
 import org.apache.shardingsphere.sharding.route.engine.condition.engine.impl.InsertClauseShardingConditionEngine;

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/test/java/org/apache/shardingsphere/sharding/route/engine/validator/ddl/ShardingCreateFunctionStatementValidatorTest.java

@@ -20,8 +20,8 @@
 import org.apache.shardingsphere.infra.binder.statement.CommonSQLStatementContext;
 import org.apache.shardingsphere.infra.binder.statement.SQLStatementContext;
 import org.apache.shardingsphere.infra.database.DefaultDatabase;
-import org.apache.shardingsphere.error.dialect.syntax.table.NoSuchTableException;
-import org.apache.shardingsphere.error.dialect.syntax.table.TableExistsException;
+import org.apache.shardingsphere.error.exception.syntax.table.NoSuchTableException;
+import org.apache.shardingsphere.error.exception.syntax.table.TableExistsException;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
 import org.apache.shardingsphere.sharding.route.engine.validator.ddl.impl.ShardingCreateFunctionStatementValidator;
 import org.apache.shardingsphere.sharding.rule.ShardingRule;

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/test/java/org/apache/shardingsphere/sharding/route/engine/validator/ddl/ShardingCreateIndexStatementValidatorTest.java

@@ -21,7 +21,7 @@
 import org.apache.shardingsphere.infra.exception.ShardingSphereException;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
 import org.apache.shardingsphere.infra.metadata.database.schema.decorator.model.ShardingSphereTable;
-import org.apache.shardingsphere.error.dialect.syntax.table.NoSuchTableException;
+import org.apache.shardingsphere.error.exception.syntax.table.NoSuchTableException;
 import org.apache.shardingsphere.sharding.route.engine.validator.ddl.impl.ShardingCreateIndexStatementValidator;
 import org.apache.shardingsphere.sharding.rule.ShardingRule;
 import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.index.IndexNameSegment;

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/test/java/org/apache/shardingsphere/sharding/route/engine/validator/ddl/ShardingCreateProcedureStatementValidatorTest.java

@@ -20,8 +20,8 @@
 import org.apache.shardingsphere.infra.binder.statement.CommonSQLStatementContext;
 import org.apache.shardingsphere.infra.binder.statement.SQLStatementContext;
 import org.apache.shardingsphere.infra.database.DefaultDatabase;
-import org.apache.shardingsphere.error.dialect.syntax.table.NoSuchTableException;
-import org.apache.shardingsphere.error.dialect.syntax.table.TableExistsException;
+import org.apache.shardingsphere.error.exception.syntax.table.NoSuchTableException;
+import org.apache.shardingsphere.error.exception.syntax.table.TableExistsException;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
 import org.apache.shardingsphere.sharding.route.engine.validator.ddl.impl.ShardingCreateProcedureStatementValidator;
 import org.apache.shardingsphere.sharding.rule.ShardingRule;

shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-core/src/test/java/org/apache/shardingsphere/sharding/route/engine/validator/ddl/ShardingCreateTableStatementValidatorTest.java

@@ -25,7 +25,7 @@
 import org.apache.shardingsphere.infra.route.context.RouteContext;
 import org.apache.shardingsphere.infra.route.context.RouteMapper;
 import org.apache.shardingsphere.infra.route.context.RouteUnit;
-import org.apache.shardingsphere.error.dialect.syntax.table.TableExistsException;
+import org.apache.shardingsphere.error.exception.syntax.table.TableExistsException;
 import org.apache.shardingsphere.sharding.route.engine.validator.ddl.impl.ShardingCreateTableStatementValidator;
 import org.apache.shardingsphere.sharding.rule.ShardingRule;
 import org.apache.shardingsphere.sharding.rule.TableRule;

shardingsphere-infra/shardingsphere-infra-binder/src/main/java/org/apache/shardingsphere/infra/binder/statement/dml/InsertStatementContext.java

@@ -28,8 +28,8 @@
 import org.apache.shardingsphere.infra.binder.statement.CommonSQLStatementContext;
 import org.apache.shardingsphere.infra.binder.type.TableAvailable;
 import org.apache.shardingsphere.infra.database.type.DatabaseTypeEngine;
-import org.apache.shardingsphere.error.dialect.syntax.database.NoDatabaseSelectedException;
-import org.apache.shardingsphere.error.dialect.syntax.database.UnknownDatabaseException;
+import org.apache.shardingsphere.error.exception.syntax.database.NoDatabaseSelectedException;
+import org.apache.shardingsphere.error.exception.syntax.database.UnknownDatabaseException;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
 import org.apache.shardingsphere.infra.metadata.database.schema.decorator.model.ShardingSphereSchema;
 import org.apache.shardingsphere.sql.parser.sql.common.extractor.TableExtractor;

shardingsphere-infra/shardingsphere-infra-binder/src/main/java/org/apache/shardingsphere/infra/binder/statement/dml/SelectStatementContext.java

@@ -39,8 +39,8 @@
 import org.apache.shardingsphere.infra.binder.statement.CommonSQLStatementContext;
 import org.apache.shardingsphere.infra.binder.type.TableAvailable;
 import org.apache.shardingsphere.infra.binder.type.WhereAvailable;
-import org.apache.shardingsphere.error.dialect.syntax.database.NoDatabaseSelectedException;
-import org.apache.shardingsphere.error.dialect.syntax.database.UnknownDatabaseException;
+import org.apache.shardingsphere.error.exception.syntax.database.NoDatabaseSelectedException;
+import org.apache.shardingsphere.error.exception.syntax.database.UnknownDatabaseException;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
 import org.apache.shardingsphere.infra.metadata.database.schema.decorator.model.ShardingSphereSchema;
 import org.apache.shardingsphere.sql.parser.sql.common.constant.ParameterMarkerType;

shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/communication/ProxySQLExecutor.java

@@ -43,7 +43,7 @@
 import org.apache.shardingsphere.proxy.backend.communication.jdbc.statement.JDBCBackendStatement;
 import org.apache.shardingsphere.proxy.backend.context.BackendExecutorContext;
 import org.apache.shardingsphere.proxy.backend.context.ProxyContext;
-import org.apache.shardingsphere.error.dialect.transaction.TableModifyInTransactionException;
+import org.apache.shardingsphere.error.exception.transaction.TableModifyInTransactionException;
 import org.apache.shardingsphere.proxy.backend.session.transaction.TransactionStatus;
 import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
 import org.apache.shardingsphere.sql.parser.sql.common.statement.ddl.CloseStatement;

shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/communication/ReactiveProxySQLExecutor.java

@@ -36,7 +36,7 @@
 import org.apache.shardingsphere.proxy.backend.communication.vertx.executor.ProxyReactiveExecutor;
 import org.apache.shardingsphere.proxy.backend.context.BackendExecutorContext;
 import org.apache.shardingsphere.proxy.backend.context.ProxyContext;
-import org.apache.shardingsphere.error.dialect.transaction.TableModifyInTransactionException;
+import org.apache.shardingsphere.error.exception.transaction.TableModifyInTransactionException;
 import org.apache.shardingsphere.proxy.backend.session.transaction.TransactionStatus;
 import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
 import org.apache.shardingsphere.sql.parser.sql.common.statement.ddl.DDLStatement;

shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/context/ProxyContext.java

@@ -26,7 +26,7 @@
 import org.apache.shardingsphere.infra.state.StateContext;
 import org.apache.shardingsphere.mode.manager.ContextManager;
 import org.apache.shardingsphere.proxy.backend.communication.jdbc.datasource.JDBCBackendDataSource;
-import org.apache.shardingsphere.error.dialect.syntax.database.NoDatabaseSelectedException;
+import org.apache.shardingsphere.error.exception.syntax.database.NoDatabaseSelectedException;
 
 import java.util.Collection;
 import java.util.LinkedList;