学步园

boolean getGeneratedKeysSupport;<br /> try {<br /> Statement.class.getMethod("getGeneratedKeys", null);<br /> getGeneratedKeysSupport = true;<br /> }<br /> catch (NoSuchMethodException nsme) {<br /> getGeneratedKeysSupport = false;<br /> }<br /> JVM_SUPPORTS_GET_GENERATED_KEYS = getGeneratedKeysSupport;<br /> if (!JVM_SUPPORTS_GET_GENERATED_KEYS) log.info("JVM does not support Statement.getGeneratedKeys()");</p> <p> boolean linkedHashSupport;<br /> try {<br /> Class.forName("java.util.LinkedHashSet");<br /> linkedHashSupport = true;<br /> }<br /> catch (ClassNotFoundException cnfe) {<br /> linkedHashSupport = false;<br /> }<br /> JVM_SUPPORTS_LINKED_HASH_COLLECTIONS = linkedHashSupport;<br /> if (!JVM_SUPPORTS_LINKED_HASH_COLLECTIONS) log.info("JVM does not support LinkedHasMap, LinkedHashSet - ordered maps and sets disabled");</p> <p> JVM_HAS_TIMESTAMP_BUG = new Timestamp(123456789).getTime() != 123456789;<br /> if (JVM_HAS_TIMESTAMP_BUG) log.info("using workaround for JVM bug in java.sql.Timestamp");<br /> Timestamp t = new Timestamp(0);<br /> t.setNanos(5 * 1000000);<br /> JVM_HAS_JDK14_TIMESTAMP = t.getTime() == 5;<br /> if (JVM_HAS_JDK14_TIMESTAMP) {<br /> log.info("using JDK 1.4 java.sql.Timestamp handling");<br /> }<br /> else {<br /> log.info("using pre JDK 1.4 java.sql.Timestamp handling");<br /> }