websphere liberty - SLF4J jars 与 websphere 内部包冲突

Question

我有一个 OSGi 应用程序，它包含 3 个捆绑包 -

1 - LoggingWrapper，充当 log4j 和 slf4j jar 的包装器，并导出 org.slf4j.* 包。

2 - MyProject，其中包含 JPA 代码，并导入以下包：

Import-Package: javax.management,
 javax.naming,
 javax.persistence;version="1.1.0",
 javax.persistence.criteria;version="1.1.0",
 javax.persistence.metamodel;version="1.1.0",
 javax.sql;version="0.0.0",
 javax.transaction;version="1.1.0",
 javax.transaction.xa;version="1.1.0",
 org.apache.openjpa.enhance;version="2.2.0",
 org.apache.openjpa.util;version="2.2.0",
 org.slf4j

在服务器上部署它会导致以下错误：

[AUDIT   ] CWWKZ0404E: An exception was generated when trying to resolve the contents of the application JpaTestApp.  The exception text from the OSGi framework is: Uses constraint violation. Unable to resolve resource MyProject [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/MyProject_1.0.0.jar] because it is exposed to package 'org.slf4j' from resources LoggingWrapper [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/LoggingWrapper_1.0.0.jar] and com.ibm.ws.slf4j-api.1.7.7 [osgi.identity; osgi.identity="com.ibm.ws.slf4j-api.1.7.7"; type="osgi.bundle"; version:Version="1.0.7.cl50420141211-1039"] via two dependency chains.

Chain 1:
  MyProject [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/MyProject_1.0.0.jar]
    import: (&(osgi.wiring.package=org.slf4j)(version>=0.0.0))
     |
    export: osgi.wiring.package: org.slf4j
  LoggingWrapper [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/LoggingWrapper_1.0.0.jar]

Chain 2:
  MyProject [IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/defaultServer/apps/JpaTestApp.eba/MyProject_1.0.0.jar]
    import: (&(osgi.wiring.package=org.apache.openjpa.util)(version>=2.2.0))
     |
    export: osgi.wiring.package=org.apache.openjpa.util; uses:=org.slf4j
  com.ibm.ws.jpa [osgi.identity; osgi.identity="com.ibm.ws.jpa"; type="osgi.bundle"; version:Version="1.0.7.cl50420141211-1039"]
    import: (osgi.wiring.package=org.slf4j)
     |
    export: osgi.wiring.package: org.slf4j
  com.ibm.ws.slf4j-api.1.7.7 [osgi.identity; osgi.identity="com.ibm.ws.slf4j-api.1.7.7"; type="osgi.bundle"; version:Version="1.0.7.cl50420141211-1039"]
[AUDIT   ] CWWKZ0020I: Application JpaTestApp not updated.

从应用程序中删除“LoggingWrapper”包会导致以下错误：

[AUDIT   ] CWWKZ0058I: Monitoring dropins for applications. 
[AUDIT   ] CWWKZ0404E: An exception was generated when trying to resolve the contents of the application JpaTestApp.  The exception text from the OSGi framework is: Unable to resolve IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/experimentalServer/apps/JpaTestApp.eba/XLetDBUtility_1.0.0.jar: missing requirement org.apache.aries.subsystem.core.archive.ImportPackageRequirement: namespace=osgi.wiring.package, attributes={}, directives={filter=(&(osgi.wiring.package=org.slf4j)(version>=0.0.0))}, resource=IFileAdapter wrapping file with url file:/D:/programs/WebSphere/liberty/wlp/usr/servers/experimentalServer/apps/JpaTestApp.eba/XLetDBUtility_1.0.0.jar
[AUDIT   ] CWWKZ0012I: The application JpaTestApp was not started.

如何解决这些错误？

Answer 1

虽然 Liberty 旨在将应用程序与运行时中包含的开源库（例如 slf4j）隔离开来，但如果导入一些 openjpa 包，似乎会有一点泄漏。您应该能够在您的应用程序中使用 JPA，而无需导入 org.apache.openjpa* 包，因此最好的办法是避免使用它们。切换到动态运行时增强（而不是构建时增强）将节省构建步骤并允许您删除 openjpa 包导入。