inserting huge file into bytea cause out of memory

Hello everyone！
 I got a out of memory problem, when I tried to insert a binary file (256MB) to bytea column; 
 I want to get a way to insert files (vary from 1byte to 2GB)  or byte array or binary stream into
 PostgreSQL bytea field, never cause out of memory. Fellowed by the details.
 Anybody know about this, please write to me.
 Thanks in advance!
 
Table defination: 
     create table image_bytea(t_id int, t_image  bytea);
 Major code:
     String sql = "insert into image_bytea(t_id, t_image) values (?, ?)";
     ps = conn.prepareStatement(sql);
    ps.setInt(1, 88);
     File file = new file("d://1.jpg"); 
    InputStream in = new BufferedInputStream(new FileInputStream(file));
     ps.setBinaryStream(2, in, (int) file.length());
     System.out.println("set");
     ps.executeUpdate();
Error detail:
org.postgresql.util.PSQLException: Error: out of memory
  Details:Failed on request of size 268443660.
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:410)
at com.highgo.hgdbadmin.migrationassistant.controller.MigrationController.executeInsert(MigrationController.java:1400)
at com.highgo.hgdbadmin.migrationassistant.controller.MigrationController.insertDate2HG(MigrationController.java:1143)
at com.highgo.hgdbadmin.migrationassistant.controller.MigrationController.migrateTable(MigrationController.java:898)
at com.highgo.hgdbadmin.migrationassistant.controller.MigrationController.migrate(MigrationController.java:301)
at com.highgo.hgdbadmin.migrationassistant.controller.MigrationController.access$000(MigrationController.java:66)
at
com.highgo.hgdbadmin.migrationassistant.controller.MigrationController$MigrateRunnable.run(MigrationController.java:241)
at java.lang.Thread.run(Thread.java:662)


Liu Yuanyuan
August 6, 2013