java - How to add a MimeMultipart to another one? -

this possibly stupid question, i'm trying compose email message suggested here

• multipart/mixed
  • multipart/alternative
    • text/html
    • text/plain
  • attachment 1
  • attachment 2

so i'm having

mimemultipart altpart = new mimemultipart("alternative");  bodypart textpart = new mimebodypart(); textpart.setcontent("sometext", "text/plain"); altpart.addbodypart(textpart);  bodypart htmlpart = new mimebodypart(); htmlpart.setcontent("somehtml", "text/html"); altpart.addbodypart(htmlpart);  mimemultipart mixedpart = new mimemultipart("multipart/mixed"); 

and need add altpart mixedpart, can't adding method accepts bodypart only. wtf?

^{note unlike here, i'm not mixing packages.}

you need wrap mimemultipart in mimebodypart, using mimebodypart.setcontent(multipart mp) method. can add mimebodypart mixedpart object:

mimemultipart alternativemultipart = new mimemultipart("alternative");  bodypart textpart = new mimebodypart(); textpart.setcontent("sometext", "text/plain"); alternativemultipart.addbodypart(textpart);  bodypart htmlpart = new mimebodypart(); htmlpart.setcontent("somehtml", "text/html"); alternativemultipart.addbodypart(htmlpart);  mimebodypart alternativebodypart = new mimebodypart(); alternativebodypart.setcontent(alternativemultipart);  mimemultipart mixedmultipart = new mimemultipart("mixed"); mixedmultipart.addbodypart(alternativebodypart);  mimebodypart textpart1 = new mimebodypart(); textpart1.setcontent("someothertext", "text/plain"); mixedmultipart.addbodypart(textpart1);