问题
I am tring to write data into Excel using Apache,i am getting error in this line XSSFWorkbook workbook = new XSSFWorkbook();I posted my error log below please check.
Process: app.msupply.com.ideaurben, PID: 28508
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/xmlbeans/XmlOptions;
at org.apache.poi.POIXMLDocumentPart.<clinit>(POIXMLDocumentPart.java:53)
at app.msupply.com.ideaurben.Adapter.ReportcateorieslistAdapter$MyViewHolder$2.onResponse(ReportcateorieslistAdapter.java:384)
at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: java.lang.ClassNotFoundException: Didn't find class "org.apache.xmlbeans.XmlOptions" on path: DexPathList[[zip file "/data/app/app.msupply.com.ideaurben-1/base.apk"],nativeLibraryDirectories=[/data/app/app.msupply.com.ideaurben-1/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at org.apache.poi.POIXMLDocumentPart.<clinit>(POIXMLDocumentPart.java:53)
at app.msupply.com.ideaurben.Adapter.ReportcateorieslistAdapter$MyViewHolder$2.onResponse(ReportcateorieslistAdapter.java:384)
at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Suppressed: java.lang.ClassNotFoundException: org.apache.xmlbeans.XmlOptions
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 11 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
my libs folder: i add all the library in libs folder.
My java class Code:
try {
String FILE_NAME = "/tmp/MyFirstExcel.xlsx";
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("Datatypes in Java");
Object[][] datatypes = {
{"Datatype", "Type", "Size(in bytes)"},
{"int", "Primitive", 2},
{"float", "Primitive", 4},
{"double", "Primitive", 8},
{"char", "Primitive", 1},
{"String", "Non-Primitive", "No fixed size"}
};
int rowNum = 0;
System.out.println("Creating excel");
Iterator<org.apache.poi.ss.usermodel.Row> rowIterator = sheet.iterator();
for (Object[] datatype : datatypes) {
Row row = sheet.createRow(rowNum++);
int colNum = 0;
for (Object field : datatype) {
Cell cell = row.createCell(colNum++);
if (field instanceof String) {
cell.setCellValue((String) field);
} else if (field instanceof Integer) {
cell.setCellValue((Integer) field);
}
}
}
FileOutputStream outputStream = new FileOutputStream(FILE_NAME);
workbook.write(outputStream);
// workbook.close();
} catch (IOException e) {
e.printStackTrace();
} /*catch (JSONException e) {
e.printStackTrace();
}*//*catch (FileNotFoundException e) {
e.printStackTrace();
}*/
}
Build.gradel file as below.
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.0"
defaultConfig {
applicationId "app.msupply.com.ideaurben"
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
dexOptions {
jumboMode true
}
packagingOptions {
exclude 'META-INF/DEPENDENCIES.txt'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/NOTICE.txt'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/notice.txt'
exclude 'META-INF/license.txt'
exclude 'META-INF/dependencies.txt'
exclude 'META-INF/LGPL2.1'
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:26.+'
compile 'com.android.support:support-v4:26.+'
compile 'com.squareup.retrofit2:retrofit:2.0.2'
compile 'com.squareup.okhttp3:logging-interceptor:3.0.1'
compile 'com.android.support:cardview-v7:25.2.0'
testCompile 'junit:junit:4.12'
}
please help anyone,Thanks in advance.
回答1:
I'd like to correct the perspective of others on NoClassDefFoundError.
NoClassDefFoundError can occur for multiple reasons like
ClassNotFoundException-- .class not found for that referenced class irrespective of whether it is available at compile time or not(i.e base/child class).- Class file located, but Exception raised while initializing static variables
- Class file located, Exception raised while initializing static blocks
What it means by saying "available in compile time"?
- The referenced class is used in the code.
Eg: Two classes, A and B(extends A). If B is referenced directly in the code, it is available at compile time, i.e.
A a = new B();
What it means by saying "not available at compile time"?
The compile time class and runtime class are different, i.e. for example base class is loaded using classname of child class for example Class.forName("classname") Eg: Two classes, A and B(extends A). Code has
A a = Class.forName("B").newInstance();
来源：https://stackoverflow.com/questions/46297250/error-java-lang-noclassdeffounderror-failed-resolution-of-lorg-apache-xmlbean