bladex-tool 打包报错如下，辛苦看下。

[ERROR] Failed to execute goal on project blade-core-db: Could not resolve dependencies for project org.springblade:blad

e-core-db:jar:3.1.1.RELEASE: Failed to collect dependencies at com.oracle:ojdbc7:jar:12.2.0.1: Failed to read artifact d

escriptor for com.oracle:ojdbc7:jar:12.2.0.1: The following artifacts could not be resolved: com.oracle:ojdbc7:pom:12.2.

0.1 (absent): Could not transfer artifact com.oracle:ojdbc7:pom:12.2.0.1 from/to bladex (https://center.javablade.com/ap

i/packages/blade/maven): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

[ERROR]

[ERROR] After correcting the problems, you can resume the build with the command

[ERROR]   mvn <args> -rf :blade-core-db