mbed test program

gistfile1.txt

#include "mbed.h"
#include <rtos.h>
#define APPLICATION_JUMP_TIMEOUT 8 //in seconds
#define APPLICATION_ADDRESS 0x08000000 //Starting at 50 kB
#define APPLICATION_SIZE 150  //in kB
Serial serial(PA_2  ,PA_3  );
extern bool jump_to_main_app_flag;

Timer jump_timer;
uint16_t jump_time;

DigitalOut led1(LED1);
DigitalOut led2(LED3);

typedef void (*pFunction)(void);
pFunction execute_application = (pFunction)*(__IO uint32_t*)(APPLICATION_ADDRESS + 4);

void jump_application()
{
	__disable_irq();
    NVIC_DisableIRQ(TIM2_IRQn);
    __set_MSP(*(__IO uint32_t*)APPLICATION_ADDRESS);
    serial.printf("\n\nApplication address set!");
    
    serial.printf("\nJumping to main application...\n\n");
   

    execute_application();
	serial.printf("\infinte loop main application...\n\n");
    
    while(1);
}


void switch_off_system()
{   
    serial.printf("\nSwitching off system...");
    while(1);
}

void main1(void const * args)
{
	
    led1 = 0;
    led2 = 1;
	
	int hash_val;
	uint32_t application_address = APPLICATION_ADDRESS;
	 
    jump_timer.start();

    while(1)
    { 
       
            jump_time = jump_timer.read_ms();
            if(jump_time > APPLICATION_JUMP_TIMEOUT*1000)
            {
                serial.printf("\nProgram jump flag set!");
                jump_to_main_app_flag = true;
				jump_application(); 
            }    
			led2 = !led2;
			wait_ms(1000);
        
			
	}
 
}

int main()
{
     led2 = 1;
     serial.baud(9600);    
     serial.printf("\n-----Bootlader RTOS FIRMWARE TEST-----");
	 Thread thread3(main1);  	
	  /* We should never get here as control is now taken by the scheduler */
	  for( ;; );	 
}

Hello,I have a question. I make the bootloader 's .bin and combine with application.bin.The bootloader's function is jump directly application.But it does not.
The follow is bootloader code.

#include <events/mbed_events.h>
#include <mbed.h>

int main()
{
mbed_start_application(POST_APPLICATION_ADDR);
}