[英]Adding a .jar file to classpath through maven
I'm having some trouble in getting maven to download a number of .jar files my application depends on. 我在让Maven下载我的应用程序依赖的多个.jar文件时遇到了一些麻烦。 The code in which these dependencies are needed is bellow:
下面是需要这些依赖项的代码:
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectReader;
import com.fasterxml.jackson.databind.ObjectWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class ServerConfiguration {
public String info = null;
public String idlURL = null;
public String idlContents = null;
public List<ServerInfo> servers = new ArrayList<>();
public final void clear() {
info = null;
idlURL = null;
idlContents = null;
if (servers != null)
servers.clear();
}
private final static ObjectReader jsonReader;
private final static ObjectWriter jsonWriter;
static {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true); // <== Error:(52, 15) java: cannot access com.fasterxml.jackson.core.JsonGenerator class file for com.fasterxml.jackson.core.JsonGenerator not found
//mapper.configure(SerializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED, true);
jsonWriter = mapper.writer();
jsonReader = mapper.reader(ServerConfiguration.class);
}
public static ServerConfiguration fromJson(String json) throws IOException {
return jsonReader.<ServerConfiguration>readValue(json); // <== Error:(59, 26) java: cannot access com.fasterxml.jackson.core.JsonProcessingException class file for com.fasterxml.jackson.core.JsonProcessingException not found
}
public String toJson() throws IOException {
return jsonWriter.writeValueAsString(this);
}
}
After reading this question, I tried adding the mentioned packages( jackson-databind , jackson-core ) to pom.xml : 阅读此问题后,我尝试将提到的软件包( jackson-databind , jackson-core )添加到pom.xml中 :
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>17.0</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.0.21.Final</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>1.7.7</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr4-maven-plugin</artifactId>
<version>4.2.2</version>
</dependency>
</dependencies>
How can I add the respective dependencies? 如何添加各自的依赖关系?
Edit #1: 编辑#1:
The errors given are bellow(the lines where they occur are marked in the code above): 出现以下错误(在上面的代码中标记了发生错误的行):
Error:(52, 15) java: cannot access com.fasterxml.jackson.core.JsonGenerator
class file for com.fasterxml.jackson.core.JsonGenerator not found
Error:(54, 28) java: cannot access com.fasterxml.jackson.core.ObjectCodec
class file for com.fasterxml.jackson.core.ObjectCodec not found
Error:(55, 28) java: cannot access com.fasterxml.jackson.core.Base64Variant
class file for com.fasterxml.jackson.core.Base64Variant not found
Error:(59, 26) java: cannot access com.fasterxml.jackson.core.JsonProcessingException
class file for com.fasterxml.jackson.core.JsonProcessingException not found
Error:(63, 26) java: cannot access com.fasterxml.jackson.core.Versioned
class file for com.fasterxml.jackson.core.Versioned not found
Edit #2: 编辑#2:
I can't seem to add the dependencies: 我似乎无法添加依赖项:
For databind you want this: 对于数据绑定,您需要这样做:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.3.3</version>
</dependency>
What is missing? 什么东西少了? Can you post an error message or stack trace?
您可以发布错误消息或堆栈跟踪吗?
Here is a good site to find dependencies for maven. 这是一个找到maven依赖项的好站点。
Can you try with 2.5.4
version as below: 您可以尝试以下
2.5.4
版本吗:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.5.4</version>
</dependency>
In IntelliJ, try to tick a checkbox
"export" in your dependencies
. 在IntelliJ中,尝试在您的
dependencies
checkbox
“导出” checkbox
。
I mean: Project Structure -> Modules -> Dependencies, and there you can see libs included to the module. 我的意思是:项目结构->模块->依赖关系,在那里您可以看到模块中包含的库。 You should also see a
checkbox
near each lib in column 'Export'. 您还应该在“导出”列中每个库附近看到一个
checkbox
。
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