Eclipse匯入 編譯時出現這個要怎麼辦

eixzir

	Eclipse匯入 編譯時出現這6個 warnings怎麼辦 Buildfile: C:\workspace\l1j\build.xml clean: compile_loader:     [mkdir] Created dir: C:\workspace\l1j\bin     [javac] Compiling 1 source file to C:\workspace\l1j\bin jar_loader:       [jar] Building jar: C:\workspace\l1j\l1jloader.jar    [delete] Deleting directory C:\workspace\l1j\bin compile_server:     [mkdir] Created dir: C:\workspace\l1j\bin     [javac] Compiling 680 source files to C:\workspace\l1j\bin     [javac] C:\workspace\l1j\src\l1j\server\server\Account.java:28: warning: BASE64Encoder is internal proprietary API and may be removed in a future release     [javac] import sun.misc.BASE64Encoder;     [javac]                ^     [javac] C:\workspace\l1j\src\l1j\server\server\Logins.java:24: warning: BASE64Decoder is internal proprietary API and may be removed in a future release     [javac] import sun.misc.BASE64Decoder;     [javac]                ^     [javac] C:\workspace\l1j\src\l1j\server\server\Logins.java:25: warning: BASE64Encoder is internal proprietary API and may be removed in a future release     [javac] import sun.misc.BASE64Encoder;     [javac]                ^     [javac] C:\workspace\l1j\src\l1j\server\server\Account.java:98: warning: BASE64Encoder is internal proprietary API and may be removed in a future release     [javac]                 return new BASE64Encoder().encode(buf);     [javac]                            ^     [javac] C:\workspace\l1j\src\l1j\server\server\Logins.java:54: warning: BASE64Decoder is internal proprietary API and may be removed in a future release     [javac]                                 abyte2 = new BASE64Decoder().decodeBuffer(rs.getString(1));     [javac]                                              ^     [javac] C:\workspace\l1j\src\l1j\server\server\Logins.java:66: warning: BASE64Encoder is internal proprietary API and may be removed in a future release     [javac]                                         pstm.setString(2, new BASE64Encoder().encode(abyte1));     [javac]                                                               ^     [javac] 6 warnings copy_c3p0_config:      [copy] Copying 1 file to C:\workspace\l1j\bin jar_server:       [jar] Building jar: C:\workspace\l1j\l1jserver.jar    [delete] Deleting directory C:\workspace\l1j\bin all: BUILD SUCCESSFUL Total time: 6 seconds