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JDBC connection pooling for Java 11+
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package org.xbib.io.pool.jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;

/**
 * This is the proxy class for java.sql.Statement.
 */
public class ProxyStatement implements Statement {

    protected final ProxyConnection connection;

    protected final Statement delegate;

    private boolean isClosed;

    private ResultSet proxyResultSet;

    public ProxyStatement(ProxyConnection connection, Statement statement) {
        this.connection = connection;
        this.delegate = statement;
    }

    public Statement getDelegate() {
        return delegate;
    }

    @SuppressWarnings("unused")
    public SQLException checkException(SQLException e) {
        return connection.checkException(e);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        final String delegateToString = delegate.toString();
        return this.getClass().getSimpleName() + '@' + System.identityHashCode(this) + " wrapping " + delegateToString;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void close() throws SQLException {
        synchronized (this) {
            if (isClosed) {
                return;
            }
            isClosed = true;
        }
        connection.untrackStatement(delegate);
        try {
            delegate.close();
        } catch (SQLException e) {
            throw connection.checkException(e);
        }
    }

    @Override
    public int getMaxFieldSize() throws SQLException {
        return delegate.getMaxFieldSize();
    }

    @Override
    public void setMaxFieldSize(int max) throws SQLException {
        delegate.setMaxFieldSize(max);
    }

    @Override
    public int getMaxRows() throws SQLException {
        return delegate.getMaxRows();
    }

    @Override
    public void setMaxRows(int max) throws SQLException {
        delegate.setMaxRows(max);
    }

    @Override
    public void setEscapeProcessing(boolean enable) throws SQLException {
        delegate.setEscapeProcessing(enable);
    }

    @Override
    public int getQueryTimeout() throws SQLException {
        return delegate.getQueryTimeout();
    }

    @Override
    public void setQueryTimeout(int seconds) throws SQLException {
        delegate.setQueryTimeout(seconds);
    }

    @Override
    public void cancel() throws SQLException {
        delegate.cancel();
    }

    @Override
    public SQLWarning getWarnings() throws SQLException {
        return delegate.getWarnings();
    }

    @Override
    public void clearWarnings() throws SQLException {
        delegate.clearWarnings();
    }

    @Override
    public void setCursorName(String name) throws SQLException {
        delegate.setCursorName(name);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Connection getConnection() throws SQLException {
        return connection;
    }

    @Override
    public boolean getMoreResults(int current) throws SQLException {
        return delegate.getMoreResults(current);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean execute(String sql) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.execute(sql);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean execute(String sql, int autoGeneratedKeys) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.execute(sql, autoGeneratedKeys);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ResultSet executeQuery(String sql) throws SQLException {
        connection.markCommitStateDirty();
        ResultSet resultSet = delegate.executeQuery(sql);
        return ProxyFactory.getProxyResultSet(connection, this, resultSet);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int executeUpdate(String sql) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeUpdate(sql);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int[] executeBatch() throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeBatch();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int executeUpdate(String sql, int autoGeneratedKeys) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeUpdate(sql, autoGeneratedKeys);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int executeUpdate(String sql, int[] columnIndexes) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeUpdate(sql, columnIndexes);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int executeUpdate(String sql, String[] columnNames) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeUpdate(sql, columnNames);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean execute(String sql, int[] columnIndexes) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.execute(sql, columnIndexes);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean execute(String sql, String[] columnNames) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.execute(sql, columnNames);
    }

    @Override
    public int getResultSetHoldability() throws SQLException {
        return delegate.getResultSetHoldability();
    }

    @Override
    public boolean isClosed() throws SQLException {
        return delegate.isClosed();
    }

    @Override
    public void setPoolable(boolean poolable) throws SQLException {
        delegate.setPoolable(poolable);
    }

    @Override
    public boolean isPoolable() throws SQLException {
        return delegate.isPoolable();
    }

    @Override
    public void closeOnCompletion() throws SQLException {
        delegate.closeOnCompletion();
    }

    @Override
    public boolean isCloseOnCompletion() throws SQLException {
        return delegate.isCloseOnCompletion();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public long[] executeLargeBatch() throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeLargeBatch();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public long executeLargeUpdate(String sql) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeLargeUpdate(sql);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public long executeLargeUpdate(String sql, int autoGeneratedKeys) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeLargeUpdate(sql, autoGeneratedKeys);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public long executeLargeUpdate(String sql, int[] columnIndexes) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeLargeUpdate(sql, columnIndexes);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public long executeLargeUpdate(String sql, String[] columnNames) throws SQLException {
        connection.markCommitStateDirty();
        return delegate.executeLargeUpdate(sql, columnNames);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ResultSet getResultSet() throws SQLException {
        final ResultSet resultSet = delegate.getResultSet();
        if (resultSet != null) {
            if (proxyResultSet == null || ((ProxyResultSet) proxyResultSet).getDelegate() != resultSet) {
                proxyResultSet = ProxyFactory.getProxyResultSet(connection, this, resultSet);
            }
        } else {
            proxyResultSet = null;
        }
        return proxyResultSet;
    }

    @Override
    public int getUpdateCount() throws SQLException {
        return delegate.getUpdateCount();
    }

    @Override
    public boolean getMoreResults() throws SQLException {
        return delegate.getMoreResults();
    }

    @Override
    public void setFetchDirection(int direction) throws SQLException {
        delegate.setFetchDirection(direction);
    }

    @Override
    public int getFetchDirection() throws SQLException {
        return delegate.getFetchDirection();
    }

    @Override
    public void setFetchSize(int rows) throws SQLException {
        delegate.setFetchSize(rows);
    }

    @Override
    public int getFetchSize() throws SQLException {
        return delegate.getFetchSize();
    }

    @Override
    public int getResultSetConcurrency() throws SQLException {
        return delegate.getResultSetConcurrency();
    }

    @Override
    public int getResultSetType() throws SQLException {
        return delegate.getResultSetType();
    }

    @Override
    public void addBatch(String sql) throws SQLException {
        delegate.addBatch(sql);
    }

    @Override
    public void clearBatch() throws SQLException {
        delegate.clearBatch();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ResultSet getGeneratedKeys() throws SQLException {
        ResultSet resultSet = delegate.getGeneratedKeys();
        if (proxyResultSet == null || ((ProxyResultSet) proxyResultSet).getDelegate() != resultSet) {
            proxyResultSet = ProxyFactory.getProxyResultSet(connection, this, resultSet);
        }
        return proxyResultSet;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    @SuppressWarnings("unchecked")
    public final  T unwrap(Class iface) throws SQLException {
        if (iface.isInstance(delegate)) {
            return (T) delegate;
        } else if (delegate != null) {
            return delegate.unwrap(iface);
        }
        throw new SQLException("Wrapped statement is not an instance of " + iface);
    }

    @Override
    public boolean isWrapperFor(Class iface) throws SQLException {
        return delegate.isWrapperFor(iface);
    }
}