Java 使用 Jackson 映射器的正确依赖集
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Correct set of dependencies for using Hymanson mapper
提问by Hossein
I am new to Hymanson and I was writing some code for practice. I found out the the new version of Hymanson library can be found on Fasterxml: Hymanson, so I added the below dependencies to my Maven pom file:
我是Hyman逊的新手，我正在编写一些练习代码。我发现新版本的 Hymanson 库可以在 Fasterxml: Hymanson上找到，所以我将以下依赖项添加到我的 Maven pom 文件中：
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-annotations</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-core</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
<version>2.2.2</version>
</dependency>
I was expecting that I can use the ObjectMapperdirectly, however after spending a lot of time I found out that to use the ObjectMapperI have to add the old libraries below:
我原以为可以ObjectMapper直接使用，但是花了很多时间后我发现要使用ObjectMapper我必须添加下面的旧库：
<dependency>
<groupId>org.codehaus.Hymanson</groupId>
<artifactId>Hymanson-mapper-asl</artifactId>
<version>1.9.2</version>
</dependency>
<dependency>
<groupId>org.codehaus.Hymanson</groupId>
<artifactId>Hymanson-core-asl</artifactId>
<version>1.9.2</version>
</dependency>
I am a bit confused. Could someone please tell me why is that?
我有点困惑。有人可以告诉我这是为什么吗？
回答by chenrui
回答by specializt
No, you can simply use com.fasterxml.Hymanson.databind.ObjectMapper.
Most likely you forgot to fix your import-statements, delete all references to codehaus and you're golden.
不，您可以简单地使用com.fasterxml.Hymanson.databind.ObjectMapper. 很可能您忘记修复您的import-statements，删除对 codehaus 的所有引用，然后您就成功了。
回答by ASD
<properties>
<!-- Use the latest version whenever possible. -->
<Hymanson.version>2.4.4</Hymanson.version>
</properties>
<dependencies>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
<version>${Hymanson.version}</version>
</dependency>
</dependencies>
you have a ObjectMapper (from Hymanson Databind package) handy. if so, you can do:
你有一个方便的 ObjectMapper（来自 Hymanson Databind 包）。如果是这样，你可以这样做：
JsonFactory factory = objectMapper.getFactory();
Source: https://github.com/FasterXML/Hymanson-core
来源：https: //github.com/FasterXML/Hymanson-core
So, the 3 "fasterxml" dependencies which you already have in u'r pom are enough for ObjectMapper as it includes Hymanson-databind.
因此，您在 pom 中已经拥有的 3 个“fasterxml”依赖项对于 ObjectMapper 来说已经足够了，因为它包括 Hymanson-databind。
回答by QGA
I spent few hours on this.
我在这上面花了几个小时。
Even if I had the right dependency the problem was fixed only after I deleted the com.fasterxml.Hymanson folder in the .m2 repository under C:\Users\username.m2 and updated the project
即使我有正确的依赖关系，只有在我删除 C:\Users\username.m2 下 .m2 存储库中的 com.fasterxml.Hymanson 文件夹并更新项目后，问题才得到解决
回答by nilesh
Apart from fixing the imports, do a fresh maven clean compile -U. Note the -Uoption, that brings in new dependencies which sometimes the editor has hard time with. Let the compilation fail due to un-imported classes, but at least you have an option to import them after the maven command.
除了修复进口，做一个新鲜的maven clean compile -U. 请注意该-U选项，它会引入新的依赖项，有时编辑器很难处理这些依赖项。由于未导入的类而导致编译失败，但至少您可以选择在 maven 命令之后导入它们。
Just doing Maven->Reimport from Intellij did not work for me.
只是从 Intellij 执行 Maven->Reimport 对我不起作用。
