在只读事务与普通读 work log 中假设了一种死锁，非mysql死锁，而是jvm死锁

CREATE TABLE `mytest` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(20) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

LOCK TABLES `mytest` WRITE;
/*!40000 ALTER TABLE `mytest` DISABLE KEYS */;

INSERT INTO `mytest` (`id`, `name`)
VALUES
(1,‘db‘);

public class JdbcUtilDeadLock {

    private static final String URL_NO_TIMEZONE="jdbc:mysql://127.0.0.1:53306/mytest?useUnicode=true&characterEncoding=utf-8&useSSL=false";
    private static final String USER="root";
    private static final String PASSWORD="";

    public static void main(String []f) {
        select();
    }

    /**
     * 这个不用开启事务
     * @return
     */
    public static List<Map<String,Object>> update() {
        Connection conn = null;
        List<Map<String,Object>> list = new ArrayList<>();
        try{
            conn = DriverManager.getConnection(URL_NO_TIMEZONE, USER, PASSWORD);
            PreparedStatement pstmt = conn.prepareStatement("update mytest set `name` = ‘db‘ where id = 1");
            pstmt.executeUpdate();

        } catch (Exception e){
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 开启事务后 update阻塞
     * @return
     */
    public static List<Map<String,Object>> select() {
        Connection conn = null;
        ResultSet rs = null;
        List<Map<String,Object>> list = new ArrayList<>();
        try{
            conn = DriverManager.getConnection(URL_NO_TIMEZONE, USER, PASSWORD);

conn.setAutoCommit(false);

            /**
             * 如果不开启事务，则不会死锁
             */
        //    conn.setAutoCommit(true);

            PreparedStatement pstmt = conn.prepareStatement("select * from mytest where id = 1 for update");
            rs = pstmt.executeQuery();
            ResultSetMetaData md = rs.getMetaData(); //获得结果集结构信息,元数据
            int columnCount = md.getColumnCount();   //获得列数

            while (rs.next()) {
                Map<String,Object> rowData = new HashMap<String,Object>();
                for (int i = 1; i <= columnCount; i++) {
                    rowData.put(md.getColumnLabel(i), rs.getObject(i));
                }
                list.add(rowData);
            }
            /**
             * 阻塞死锁
             */
            update();

   if(!conn.getAutoCommit())
                conn.commit();

            System.out.println(list);

        } catch (Exception e){
            e.printStackTrace();
try {
                if(!conn.getAutoCommit())
                    conn.rollback();
            } catch (SQLException e1) {
                e1.printStackTrace();
            }

        }
        return list;
    }
}

java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction
[{name=db, id=1}]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1086)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2834)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2441)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2366)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2350)
at jdbctimezone.JdbcUtilDeadLock.update(JdbcUtilDeadLock.java:32)
at jdbctimezone.JdbcUtilDeadLock.select(JdbcUtilDeadLock.java:73)
at jdbctimezone.JdbcUtilDeadLock.main(JdbcUtilDeadLock.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

阻塞时，使用jstack

"main" #1 prio=5 os_prio=31 tid=0x00007f962a800000 nid=0x1603 runnable [0x000070000ee89000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)
at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)
at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
- locked <0x0000000795f220b0> (a com.mysql.jdbc.util.ReadAheadInputStream)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3163)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3620)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4160)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2834)
- locked <0x0000000795f18b28> (a com.mysql.jdbc.JDBC4Connection)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
- locked <0x0000000795f18b28> (a com.mysql.jdbc.JDBC4Connection)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2441)
- locked <0x0000000795f18b28> (a com.mysql.jdbc.JDBC4Connection)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2366)
- locked <0x0000000795f18b28> (a com.mysql.jdbc.JDBC4Connection)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2350)
at jdbctimezone.JdbcUtilDeadLock.update(JdbcUtilDeadLock.java:32)
at jdbctimezone.JdbcUtilDeadLock.select(JdbcUtilDeadLock.java:73)
at jdbctimezone.JdbcUtilDeadLock.main(JdbcUtilDeadLock.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

一种mysql jvm死锁