Classes not found: org.bytedeco.javacpp.BytePointer and org.bytedeco.javacpp.Pointer

[g00dnatur3]

Is there a reason i keep getting ClassNotFound issues for org.bytedeco.javacpp.BytePointer and org.bytedeco.javacpp.Pointer?

I'm using this version in my sbt: "org.bytedeco" % "javacv" % "0.9"

Am I missing something or is this a bug...

Thanks for the help

[saudet]

@jpsacha Would you have an idea of what might be happening? It seems like the JavaCPP dependencies are not getting pulled in.

[jpsacha]

I cannot reproduce the issue. I am running Cookbook examples with no problem (with 0.9). I had an issue in FlyCapture2 with a missing libiomp5md.dll (still need to figure that one out, something happened in 0.9, I just added it to path), I am running it it with 0.9.1-SNAPSHOT. But that does not seem to be related. The error report is not very specific about how to reproduce the issue.
@saudet Can you reproduce it?

[saudet]

Thanks for the feedback @jpsacha. I haven't tried to figure it out myself, no. @g00dnatur3 please provide more details about how we may go about reproducing your issue, thanks.

[g00dnatur3]

I'm using a MacBook pro with Eclipse Kepler & jdk 7.

I have a very simple Play Framework java project. I go ahead and add the sbt dependency of the 0.9 version.
There are no compile errors, it just gives me the exception when I run it using a main method.

I will post the sample code later, I don't have it with me-- but its very simple example code taken from stack overflow.

[saudet]

Containers like that usually have special instructions for libraries using JNI. Make sure you follow those instructions as well. Thanks

[shirish87]

This issue seems to occur for SBT (0.13.5) projects (Play uses SBT).

• Create a file build.sbt

libraryDependencies ++= Seq(
  "org.bytedeco" % "javacv" % "0.9",
  "org.bytedeco" % "javacpp" % "0.9"
)

• Create a file src/main/java/Test.java

import org.bytedeco.javacv.Frame;
import org.bytedeco.javacpp.Pointer;

public class Test {
    public static void main(String[] args) {
        System.out.println("Test access");
    }
}

• Run sbt run

[error] /var/apps/ar/te/src/main/java/Test.java:2: error: cannot find symbol
[error] import org.bytedeco.javacpp.Pointer;
[error]                            ^
[error]   symbol:   class Pointer
[error]   location: package org.bytedeco.javacpp
[error] 1 error
[error] (compile:compile) javac returned nonzero exit code

• Copying the javacpp-0.9.jar file to the classpath lib folder and then running sbt run works.

Gradle works just fine, so I suspect this has something to do with the way SBT handles the javacpp POM.

apply plugin: 'java'
apply plugin: 'application'

mainClassName = 'Test'

repositories {
    mavenCentral()
}

dependencies {
    compile 'org.bytedeco:javacv:0.9'
    compile 'org.bytedeco:javacpp:0.9'
}

[jpsacha]

In SBT you need to also load opencv presets including native binaries:

val javacppVersion = "0.9"

libraryDependencies ++= Seq(
  "org.bytedeco"                 % "javacv" % javacppVersion,
  "org.bytedeco.javacpp-presets" % "opencv" % ("2.4.9-" + javacppVersion) classifier "",
  "org.bytedeco.javacpp-presets" % "opencv" % ("2.4.9-" + javacppVersion) classifier platform,
)

If you know the platform you are running on you can hard-code it. You can also determine it automatically:

val platform = {
  // Determine platform name using code similar to javacpp
  // com.googlecode.javacpp.Loader.java line 60-84
  val jvmName = System.getProperty("java.vm.name").toLowerCase
  var osName = System.getProperty("os.name").toLowerCase
  var osArch = System.getProperty("os.arch").toLowerCase
  if (jvmName.startsWith("dalvik") && osName.startsWith("linux")) {
    osName = "android"
  } else if (jvmName.startsWith("robovm") && osName.startsWith("darwin")) {
    osName = "ios"
    osArch = "arm"
  } else if (osName.startsWith("mac os x")) {
    osName = "macosx"
  } else {
    val spaceIndex = osName.indexOf(' ')
    if (spaceIndex > 0) {
      osName = osName.substring(0, spaceIndex)
    }
  }
  if (osArch.equals("i386") || osArch.equals("i486") || osArch.equals("i586") || osArch.equals("i686")) {
    osArch = "x86"
  } else if (osArch.equals("amd64") || osArch.equals("x86-64") || osArch.equals("x64")) {
    osArch = "x86_64"
  } else if (osArch.startsWith("arm")) {
    osArch = "arm"
  }
  val platformName = osName + "-" + osArch
  println("platform: " + platformName)
  platformName
}

You can see an example of a complete build.sbt file in javacv-examples.

[shirish87]

Aah, thanks so much @jpsacha. My original sbt was missing: classpathTypes += "maven-plugin".
Should've checked the examples :(

[saudet]

Thanks @shirish87! @g00dnatur3, does adding the classpathTypes += "maven-plugin" fixes the issue for you as well?

[saudet]

Well, I've added that to the README.md file for version 0.10, so if there's anything that's unclear, please let me know. Thanks for the tips!