How can I successfully use the Jackson "ObjectMapper()" inside a "process()" method - apache-camel

Question

PROBLEM: using Jackson's "ObjectMapper()" within the "process()" method causes an exception...
public void process(org.apache.camel.Exchange exchange) throws IOException {
//...this statement causes the exception...
com.fasterxml.jackson.databind.ObjectMapper om = new com.fasterxml.jackson.databind.ObjectMapper();
...
}
The exception is shown in the Jboss Fuse console...looks like this...
...
2017-09-12 16:45:56,262 | INFO | edhat-187/deploy | fileinstall | 9 - org.apache.felix.fileinstall - 3.5.0 | Installing bundle aaa.bbb.ccc.camelRest / 1.0.0
2017-09-12 16:45:56,323 | WARN | edhat-187/deploy | fileinstall | 9 - org.apache.felix.fileinstall - 3.5.0 | Error while starting bundle: file:/C:/tools/jboss-fuse-6.3.0.redhat-187/deploy/camelRest-1.jar
org.osgi.framework.BundleException: Unresolved constraint in bundle aaa.bbb.ccc.camelRest [759]: Unable to resolve 759.0: missing requirement [759.0] osgi.wiring.package; (&(osgi.wiring.package=com.fasterxml.jackson.databind)(version>=2.7.0)(!(version>=3.0.0)))
at org.apache.felix.framework.Felix.resolveBundleRevision(Felix.java:4002)[org.apache.felix.framework-4.4.1.jar:]
at org.apache.felix.framework.Felix.startBundle(Felix.java:2045)[org.apache.felix.framework-4.4.1.jar:]
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:976)[org.apache.felix.framework-4.4.1.jar:]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.startBundle(DirectoryWatcher.java:1245)[9:org.apache.felix.fileinstall:3.5.0]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.startBundles(DirectoryWatcher.java:1217)[9:org.apache.felix.fileinstall:3.5.0]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.doProcess(DirectoryWatcher.java:509)[9:org.apache.felix.fileinstall:3.5.0]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.process(DirectoryWatcher.java:358)[9:org.apache.felix.fileinstall:3.5.0]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.run(DirectoryWatcher.java:310)[9:org.apache.felix.fileinstall:3.5.0]
...
QUESTION:
How can I successfully use the Jackson "ObjectMapper()" inside a "process()" method, i.e., to convert a map into json?
To provide context, below is the info on this simple application/bundle
aaa.bbb.ccc.CamelRestRoutes.java
package aaa.bbb.ccc;
import org.apache.camel.Exchange;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.cdi.ContextName;
#ContextName("rest-dsl")
public class CamelRestRoutes extends RouteBuilder {
public CamelRestRoutes() {
}
private final org.apache.camel.Processor proc1 = new Processor1();
int notificationTime = 60;
int overlapTime = 5;
String codeListString = "AA,BB";
#Override
public void configure() throws Exception {
String fromURL = "http://localhost:7001/jaxrsRestService/service/getAll";
from("timer://foo?fixedRate=true&period=" + 5000) //5 seconds... do we need to make this a system property (like notification service)???....
.setBody(constant(codeListString))
.to("direct:thingB");
from("direct:thingB")
.split().tokenize(",")
.to("direct:thingC");
from("direct:thingC")
.setHeader(Exchange.HTTP_METHOD, constant(org.apache.camel.component.http4.HttpMethods.GET))
.to("netty4-http:http://localhost:7001/jaxrsRestService/service/getAll/")
.to("direct:thingD");
from("direct:thingD")
.split()
.jsonpath("$.container[*]")
.streaming()
.parallelProcessing()
.process(proc1)
.to("wmq:queue:mylocalqueue?jmsMessageType=Text&exchangePattern=InOnly");
}
}
aaa.bbb.ccc.Processor1.java
package aaa.bbb.ccc;
import java.io.IOException;
import java.util.Map;
public class Processor1 implements org.apache.camel.Processor {
#Override
public void process(org.apache.camel.Exchange exchange) throws IOException {
//***this causes the exception***
com.fasterxml.jackson.databind.ObjectMapper.ObjectMapper om = new com.fasterxml.jackson.databind.ObjectMapper.ObjectMapper(); <== causes
Map<String, String> map = (Map<String, String>) exchange.getIn().getBody();
exchange.getIn().setBody(map.toString());
}
};
camel-route.xml
<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0"
xmlns:jaxrs="http://cxf.apache.org/blueprint/jaxrs"
xmlns:camel="http://camel.apache.org/schema/blueprint"
xsi:schemaLocation="
http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
http://cxf.apache.org/blueprint/jaxrs http://cxf.apache.org/schemas/blueprint/jaxrs.xsd
http://cxf.apache.org/blueprint/core http://cxf.apache.org/schemas/blueprint/core.xsd
">
<camel:camelContext id="aaa.bbb.ccc.routing.poc" xmlns="http://camel.apache.org/schema/blueprint">
<packageScan>
<package>aaa.bbb.ccc</package>
</packageScan>
</camel:camelContext>
<bean id="wmqcf" class="com.ibm.mq.jms.MQConnectionFactory">
<property name="hostName" value="localhost"/>
<property name="port" value="1414"/>
<property name="queueManager" value="QM1"/>
<property name="channel" value="DEV.ADMIN.SVRCONN"/>
<property name="transportType" value="1"/>
</bean>
<bean id="wmqcfw" class="org.springframework.jms.connection.UserCredentialsConnectionFactoryAdapter">
<property name="targetConnectionFactory" ref="wmqcf" />
<property name="username" value="admin" />
<property name="password" value="passw0rd" />
</bean>
<bean id="wmqcfg" class="org.apache.camel.component.jms.JmsConfiguration">
<property name="connectionFactory" ref="wmqcfw"/>
<property name="concurrentConsumers" value="10"/>
</bean>
<bean id="wmq" class="org.apache.camel.component.jms.JmsComponent">
<property name="configuration" ref="wmqcfg"/>
</bean>
</blueprint>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>aaa.bbb.ccc</groupId>
<artifactId>camelRest</artifactId>
<version>1</version>
<packaging>bundle</packaging>
<name>camelRest</name>
<description>camelRest</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<skipTests>true</skipTests>
<mq.version>8.0.0.7</mq.version>
</properties>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>2.17.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-cdi</artifactId>
<version>2.17.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-netty4-http</artifactId>
<version>2.17.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jackson</artifactId>
<version>2.17.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-http4</artifactId>
<version>2.17.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-cxf</artifactId>
<version>2.17.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.mq</groupId>
<artifactId>allclient</artifactId>
<version>${mq.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.mq</groupId>
<artifactId>jms</artifactId>
<version>${mq.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jsonpath</artifactId>
<version>2.17.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}-${project.version}</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<showDeprecation>true</showDeprecation>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<id>xjc</id>
<goals>
<goal>xjc</goal>
</goals>
</execution>
</executions>
<configuration>
<sources>
<source>src/main/resources/xsd/jaxrsRestService.xsd</source>
</sources>
<packageName>aaa.bbb.ccc.generated</packageName>
<verbose default-value="false">${xjc.verbose}</verbose>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>3.3.0</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>
<Export-Package>aaa.bbb.ccc*</Export-Package>
<Export-Package>aaa.bbb.ccc.generated*</Export-Package>
<Import-Package>*</Import-Package>
</instructions>
</configuration>
</plugin>
</plugins>
</build>
</project>
camel features installed
JBossFuse:karaf#root> features:list | grep "camel-" | grep "\[installed"
[installed ] [2.7.0 ] xml-specs-api camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-core camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-blueprint camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-spring camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-bindy camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-cdi camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-csv camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-cxf camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-exec camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-ftp camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-http4 camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jackson camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jacksonxml camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jasypt camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jaxb camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jdbc camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jms camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jmx camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-jsonpath camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-mail camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-netty4 camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-netty4-http camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-ognl camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-paxlogging camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-restlet camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-rmi camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-routebox camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-saxon camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-script camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-snmp camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-spring-javaconfig camel-2.17.0.redhat-630187
[installed ] [2.17.0.redhat-630187 ] camel-xstream camel-2.17.0.redhat-630187
[installed ] [1.2.0.redhat-630187 ] camel-amq fabric-1.2.0.redhat-630187
JBossFuse:karaf#root>
deploy directory containing IBM MQ osgi jars
Directory of C:\tools\jboss-fuse-6.3.0.redhat-187\deploy
09/13/2017 10:19 AM <DIR> .
09/13/2017 10:19 AM <DIR> ..
09/12/2017 05:10 PM 14,495 camelRest-1.jar
06/29/2017 01:00 AM 159,649 com.ibm.mq.osgi.allclientprereqs_8.0.0.7.jar
06/29/2017 01:00 AM 8,011,749 com.ibm.mq.osgi.allclient_8.0.0.7.jar
06/29/2017 01:00 AM 4,088,715 com.ibm.mq.osgi.java_8.0.0.7.jar
06/29/2017 01:00 AM 171,064 com.ibm.msg.client.osgi.commonservices.j2se_8.0.0.7.jar
06/29/2017 01:00 AM 48,715 com.ibm.msg.client.osgi.jms.prereq_8.0.0.7.jar.DISABLE
06/29/2017 01:00 AM 639,807 com.ibm.msg.client.osgi.jms_8.0.0.7.jar
06/29/2017 01:00 AM 216,218 com.ibm.msg.client.osgi.nls_8.0.0.7.jar
06/29/2017 01:00 AM 279,861 com.ibm.msg.client.osgi.wmq.nls_8.0.0.7.jar
06/29/2017 01:00 AM 92,406 com.ibm.msg.client.osgi.wmq.prereq_8.0.0.7.jar
06/29/2017 01:00 AM 7,963,226 com.ibm.msg.client.osgi.wmq_8.0.0.7.jar
09/15/2016 04:19 AM 873 README
12 File(s) 21,686,778 bytes
2 Dir(s) 142,681,493,504 bytes free
other environment info
jdk1.8.0_131
jboss-fuse-6.3.0.redhat-187
WebLogic 12.2.1 (running the rest service)
Thank you for your help!

Answer 1

The deploy error you are encountering is because you don't have the correct version of the com.fasterxml.jackson.databind jar on the classpath (as defined below). Are you using a features file for deployment? If so, please include it in your question.
org.osgi.framework.BundleException: Unresolved constraint in bundle
aaa.bbb.ccc.camelRest [585]: Unable to resolve 585.0: missing
requirement [585.0] osgi.wiring.package;
(&(osgi.wiring.package=com.fasterxml.jackson.databind)(version>=2.7.0)(!(version>=3.0.0)))
The way you are using Processor to deserialize to JSON is correct, however I would suggest creating the ObjectMapper() outside of the Process() method since you don't need a new one each time and creating one is expensive.