Convert byte[] to Base64 string for data URI

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I used this and it worked fine (contrary to the accepted answer, which uses a format not recommended for this scenario):

StringBuilder sb = new StringBuilder();
sb.append("data:image/png;base64,");
sb.append(StringUtils.newStringUtf8(Base64.encodeBase64(imageByteArray, false)));
contourChart = sb.toString();

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