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Michael MMichael M 

Static method cannot be referenced from a non static context: void ProfilityCallout.UploadDocuments(String)

Why am I getting this erorr: "Static method cannot be referenced from a non static context: void ProfilityCallout.UploadDocuments(String)"

This error appears when I try to save this class (the bold line) :
public  class S3Controller {
    public static void UploadDocToS3Server(string recordId)
    public static void UploadDocument(string recordId)
        //S3 Key 
        String key = '124'; 
        //S3 Secret Key 
        String secret = '1234';
        String bucket = '1234'; 
        String host = 's3-us-east-1.amazonaws.com';
        String method = 'PUT';
        ProfilityCallout service=new ProfilityCallout(key,secret,bucket,method,host);


And here is my other class:
public class ProfilityCallout {
    public  string awsKey {get;set;}
    public   string awsSecret {get;set;}
    public   string bucketName {get;set;}
    public   string methodName {get;set;}
    public static  string hostName {get;set;}
    public  static string statusCode {get;set;}
    public static string bucketNameStatic {get;set;}
    public static string methodNameStatic {get;set;}
    public static string hostNameStatic {get;set;}
    public  ProfilityCallout(string key, string secret, string bucket, string method, string host)
        bucketNameStatic = bucket;
        methodNameStatic = method;
        hostNameStatic = host;
    public  string ContentType(string fileType) {
        switch on fileType.toLowerCase()
            when 'docx'
                return 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
            when 'csv'
                return 'application/vnd.ms-excel';
            when 'wav'
                return 'audio/wav';
            when 'wmv'
                return 'video/x-ms-wmv';
            when 'mp3'
                return 'audio/mpeg';
            when 'mp4'
                return 'video/mp4';
            when 'png'
                return 'image/png';
            when 'pdf'
                return 'application/pdf';
            when else {
                return 'image/jpeg';
    public  string CreateAuthHeader(String contentType,
                                   String filename, String formattedDateString,string fileExtension){
                                       string auth;
                                       String stringToSign = this.methodName+'\n\n'+contentType+'\n'+formattedDateString+'\n/'+this.bucketName+'/'+filename.toLowerCase()+ '.'+fileExtension.toLowerCase();
                                       Blob mac = Crypto.generateMac('HMACSHA1', blob.valueof(stringToSign),blob.valueof(this.awsSecret));
                                       String sig = EncodingUtil.base64Encode(mac);
                                       auth = 'AWS' + ' ' + this.awsKey + ':' + sig;
                                       return auth;
    public static void UploadDocuments(string recordId){
      //  if(awsSecret.isBlank(this.awsSecret) || string.isBlank(this.awsKey) || string.isBlank(this.bucketName) || string.isBlank(this.hostName))
      //  {
         //   throw new BaseException('Set AWS credential');
      //  }
        List<ContentDocumentLink> links=[SELECT ContentDocumentId,LinkedEntityId FROM ContentDocumentLink where LinkedEntityId=:recordId];
        Set<Id> ids=new Set<Id>();
        for(ContentDocumentLink link:links)
        List<ContentVersion> versions=[SELECT VersionData,Title,ContentDocumentId,FileExtension FROM ContentVersion WHERE ContentDocumentId = :ids AND IsLatest = true];
        for(ContentVersion attach:versions) {
         //   try
         //   {
                //File Content
                String attachmentBody = EncodingUtil.base64Encode(attach.VersionData);
                String formattedDateString = Datetime.now().formatGMT('EEE, dd MMM yyyy HH:mm:ss z');
                String filename = attach.Title;
       //////FIX LATER         string contentType=ContentType(attach.FileExtension);
         /////       system.debug('contentType:'+contentType);
                string fileUrl='https://' + bucketNameStatic + '.' + hostName + '/' + filename.toLowerCase().remove(' ')+ '.'+attach.FileExtension.toLowerCase();
                HttpRequest req = new HttpRequest();
                req.setEndpoint('callout:Seek/'+ filename.toLowerCase()+ '.'+attach.FileExtension.toLowerCase());
                req.setHeader('Host', bucketNameStatic + '.' + hostNameStatic);
                req.setHeader('Content-Length', String.valueOf(attachmentBody.length()));
                req.setHeader('Content-Encoding', 'UTF-8');
         /////       req.setHeader('Content-type', contentType);
                req.setHeader('Connection', 'keep-alive');
                req.setHeader('Date', formattedDateString);
                req.setHeader('ACL', 'public-read');
                Blob pdfBlob = EncodingUtil.base64Decode(attachmentBody);
       //////FIX LATER          req.setHeader('Authorization',CreateAuthHeader(contentType, filename, formattedDateString,attach.FileExtension));
                Http http = new Http();
                HTTPResponse res = http.send(req);
               statusCode = string.valueof(res.getStatusCode());
                if (res.getStatusCode() == 200 || res.getStatusCode()==201) {
                     Messaging.SingleEmailMessage message = new Messaging.SingleEmailMessage();
                        message.setSubject('Profility S3 PUT succesful!');
                        message.setPlainTextBody('Profility S3 PUT succesful!');
                        message.setToAddresses( new String[] { '123@123.org' } );
                        Messaging.sendEmail( new Messaging.SingleEmailMessage[] { message } ); 
         //   catch(Exception ex)
         else   {
                     Messaging.SingleEmailMessage message2 = new Messaging.SingleEmailMessage();
                        message2.setSubject('issue with Profility callout');
                        message2.setPlainTextBody('issue with Profility callout '+statusCode );
                        message2.setToAddresses( new String[] { '123@123.org' } );
                        Messaging.sendEmail( new Messaging.SingleEmailMessage[] { message2 } ); 
            //   throw new BaseException(ex);
AbhinavAbhinav (Salesforce Developers) 
Hi Michael,

Use ClassName.Methodname to call static method. 

or if you want to call it this way.  ->> ProfilityCallout service=new ProfilityCallout(key,secret,bucket,method,host);

then you have to remove static keyword before method Name.

You can try either way based on you use case.

Check details here:


If it helps mark it as best answer.


Michael MMichael M

Hi Abhinav,

Thank you for your response. I just tried replacing it with this:
  ProfilityCallout service=new ProfilityCallout(key,secret,bucket,method,host);

And now I am getting a different error: "you have uncommitted work pending. please commit or rollback before calling out". How can i fix that? Am i doing it right?