json4s xpath report java.lang.NoSuchMethodError - scala

Question

I followed the example from "XPath + HOFs" part of https://github.com/json4s/json4s, below is my source code:
import org.json4s._
import org.json4s.native.JsonMethods._
object HiveToCSVEngine {
def main(args: Array[String]): Unit = {
val json = parse( """
{ "name": "joe",
"children": [
{
"name": "Mary",
"age": 5
},
{
"name": "Mazy",
"age": 3
}
]
}
""")
print((json \ "children")(0))
}
}
no compile errors, but the following error occurred at runtime:
Exception in thread "main" java.lang.NoSuchMethodError:
scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object;
at org.json4s.MonadicJValue.$bslash(MonadicJValue.scala:18)
Could anybody help me on this problem?
===How is the program invoked===
I use gradle to run above code, below is the build.gradle file(the dependencies are what is needed by other programs):
apply plugin: 'scala'
apply plugin: 'java'
apply plugin:'application'
//mainClassName = 'SimpleMail'
mainClassName = System.getProperty("mainClassName")
compileJava {
sourceCompatibility = 1.6
targetCompatibility = 1.6
}
repositories {
mavenCentral()
}
dependencies {
//can't comment scalaTools on linux because of gradle version problem
scalaTools "org.scala-lang:scala-compiler:2.11.1"
compile 'org.scala-lang:scala-library:2.11.1'
compile 'com.github.tototoshi:scala-csv_2.10:1.0.0'
compile 'com.darwinsys:hirondelle-date4j:1.5.1'
compile 'com.sun.mail:javax.mail:1.5.2'
compile 'org.apache.hive:hive-jdbc:0.13.1'
compile 'org.apache.hadoop:hadoop-core:1.2.1'
compile 'mysql:mysql-connector-java:5.1.31'
compile 'net.sourceforge.expectj:expectj:2.0.7'
compile 'org.apache.commons:commons-lang3:3.3'
compile 'org.json4s:json4s-native_2.10:3.2.10'
compile 'org.json4s:json4s-jackson_2.10:3.2.10'
}
run {
// set heap size for the test JVM(s)
minHeapSize = "128m"
maxHeapSize = "512m"
// set JVM arguments for the test JVM(s)
jvmArgs '-XX:MaxPermSize=256m'
if ( project.hasProperty('args') ) {
def paras=project.args.trim()
println "args:"+paras
def leading_paras=[]
while(paras.contains('\'')){
def prefix=paras.substring(0,paras.indexOf('\''))
def right_part=paras.substring(prefix.size()+1)
def middle=right_part.substring(0,right_part.indexOf('\''))
def tail=right_part.substring(middle.size()+1)
if(prefix.size()>0) {
leading_paras = (leading_paras << prefix.split('\\s+')) << [middle]
}else{
leading_paras =leading_paras<<[middle]
}
paras=tail.trim()
}
leading_paras=(leading_paras<<paras.split('\\s+')).flatten()
println "[param list]"
for(String para:leading_paras){
println "param:"+para+"."
}
args (leading_paras as String[])
}
}
and I run the following command to invoke the program:
gradle run -DmainClassName=HiveToCSVEngine

Answer 1

Before:
compile 'org.json4s:json4s-native_2.10:3.2.10'
compile 'org.json4s:json4s-jackson_2.10:3.2.10'
Update:
compile 'org.json4s:json4s-native_2.11:3.2.10'
compile 'org.json4s:json4s-jackson_2.11:3.2.10'
I think it's your scala is 2.11, but your json4s is 2.10