Jersey-JerseyTest:从输入流中读取实体时出错 [英] Jersey - JerseyTest: Error reading entity from input stream
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问题描述
为了学习泽西岛，我创建了一个测试项目.我创建了以下类Book.java(模型)，BookDao.java，BookResource.java，到目前为止，一切正常.我的问题是我要运行(BookResourceTest.java)的JerseyTest.我正在使用Jackson进行JSON序列化.
I have created a test project in order to learn Jersey. I have created the following classes Book.java (Model), BookDao.java, BookResource.java and so far everything works just fine. My problem is with a JerseyTest i am trying to run (BookResourceTest.java). I am using Jackson for JSON serialization.
运行测试时，出现以下错误:Error reading entity from input stream.
这是控制台输出:
When i run the test i get this error: Error reading entity from input stream.
This is the console output:
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running com.example.BookResourceTest
Ιουν 13, 2015 5:25:23 ΜΜ org.glassfish.jersey.test.grizzly.GrizzlyTestContainerFactory$GrizzlyTestContainer <init>
INFO: Creating GrizzlyTestContainer configured at the base URI http://localhost:9998/
Ιουν 13, 2015 5:25:24 ΜΜ org.glassfish.grizzly.http.server.NetworkListener start
INFO: Started listener bound to [localhost:9998]
Ιουν 13, 2015 5:25:24 ΜΜ org.glassfish.grizzly.http.server.HttpServer start
INFO: [HttpServer] Started.
Ιουν 13, 2015 5:25:24 ΜΜ org.glassfish.jersey.filter.LoggingFilter log
INFO: 1 * Sending client request on thread main
1 > GET http://localhost:9998/books
1 > Accept: application/json
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.jersey.filter.LoggingFilter log
INFO: 2 * Client response received on thread main
2 < 200
2 < Content-Length: 177
2 < Content-Type: application/json
2 < Date: Sat, 13 Jun 2015 14:25:25 GMT
[{"id":"2","title":"title2","author":"author2","isbn":"12345","published":1434205524749},{"id":"1","title":"title1","author":"author1","isbn":"45678","published":1434205524749}]
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.grizzly.http.server.NetworkListener shutdownNow
INFO: Stopped listener bound to [localhost:9998]
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.jersey.test.grizzly.GrizzlyTestContainerFactory$GrizzlyTestContainer <init>
INFO: Creating GrizzlyTestContainer configured at the base URI http://localhost:9998/
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.grizzly.http.server.NetworkListener start
INFO: Started listener bound to [localhost:9998]
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.grizzly.http.server.HttpServer start
INFO: [HttpServer-1] Started.
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.jersey.filter.LoggingFilter log
INFO: 1 * Sending client request on thread main
1 > GET http://localhost:9998/books/1
1 > Accept: application/json
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.jersey.filter.LoggingFilter log
INFO: 2 * Client response received on thread main
2 < 200
2 < Content-Length: 87
2 < Content-Type: application/json
2 < Date: Sat, 13 Jun 2015 14:25:25 GMT
{"id":"1","title":"title1","author":"author1","isbn":"45678","published":1434205525362}
Ιουν 13, 2015 5:25:25 ΜΜ org.glassfish.grizzly.http.server.NetworkListener shutdownNow
INFO: Stopped listener bound to [localhost:9998]
Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 2.393 sec <<< FAILURE!
Results :
Tests in error:
testGetBooks(com.example.BookResourceTest): Error reading entity from input stream.
testGetBook(com.example.BookResourceTest): Error reading entity from input stream.
Tests run: 2, Failures: 0, Errors: 2, Skipped: 0
我在做什么错了?
这是我的项目文件:
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>simple-service</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>simple-service</name>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>${jersey.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-grizzly2-http</artifactId>
</dependency>
<!-- uncomment this to get JSON support:
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-moxy</artifactId>
</dependency>
-->
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>${jersey.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.test-framework.providers</groupId>
<artifactId>jersey-test-framework-provider-grizzly2</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<inherited>true</inherited>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>com.example.Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<jersey.version>2.18</jersey.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>
Book.java
public class Book {
private String id;
private String title;
private String author;
private String isbn;
private Date published;
public Book(String id, String title, String author, String isbn, Date published) {
this.id = id;
this.title = title;
this.author = author;
this.isbn = isbn;
this.published = published;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
public Date getPublished() {
return published;
}
public void setPublished(Date published) {
this.published = published;
}
}
BookDao.java
public class BookDao {
private Map<String, Book> books;
public BookDao() {
books = new HashMap<>();
books.put("1", new Book("1", "title1", "author1", "45678", new Date()));
books.put("2", new Book("2", "title2", "author2", "12345", new Date()));
}
public Collection<Book> getBooks() {
return (books.values());
}
public Book getBook(String id) {
return books.get(id);
}
}
BookResource.java
@Path("/books")
public class BookResource {
BookDao dao = new BookDao();
@GET
@Produces({"application/xml", "application/json"})
public Collection<Book> getBooks() {
return dao.getBooks();
}
@Path("/{id}")
@GET
@Produces({"application/xml", "application/json"})
public Book getBook(@PathParam("id") String id) {
return dao.getBook(id);
}
}
BookResourceTest.java
public class BookResourceTest extends JerseyTest {
@Override
protected Application configure() {
enable(TestProperties.LOG_TRAFFIC);
enable(TestProperties.DUMP_ENTITY);
return new ResourceConfig().packages("com.example");
}
@Test
public void testGetBook() {
Book response = target("books").path("1").request().get(Book.class);
assertNotNull(response);
}
@Test
public void testGetBooks() {
Collection<Book> response = target("books").request().get(new GenericType<Collection<Book>>() {
});
assertEquals(2, response.size());
}
}
推荐答案
所以看来原因是Book.java没有默认的构造函数，因此Jackson无法创建它的实例...
So it seems that the reason was that the Book.java didn't have a default constructor so Jackson was unable to create an instance of it...
public class Book {
private String id;
private String title;
private String author;
private String isbn;
private Date published;
//must have default constructor
public Book() {
}
public Book(String id, String title, String author, String isbn, Date published) {
this.id = id;
this.title = title;
this.author = author;
this.isbn = isbn;
this.published = published;
}
...
}
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